Resetting the SMC on an iMac, Mac mini, or Mac Pro. Check whether the brightness on your Mac is turned all the way down, and turn it back up. You should also restart your computer, c… The SMC reset did the trick! Terms — Does the iMac power on now? Initially I thought it was a power supply problem, as the fans on the power supply wouldn't turn on. Try to use another video source or computer and see if the external display works with it. Recent MacBooks (with non-removable batteries) Shut down the computer. 7. sir no one of the our led was lighted what does it means? Very comprehensive. but your steps work! 5 Answers 1. LED # 2 comes on momentarily or stays Off: Replace the Power Supply. The PowerMac G4 MDD was notorious because of bad capacitors in the power supply. Do the same for the external display by pressing Ctrl + F2on your keyboard. If you don't see a change on your Mac, press and release the power button normally. 08/07/2019 by It should help to narrow it down. Accessibility, iMac Intel 27" EMC 2309, 2374, 2390 or 2429 Power Supply, iMac Intel 27" EMC 2429 Power Supply Replacement. Cost about $150, colin boxall 5. Indicates that the computer and the LCD display panel are communicating. If the issue persists with known-good SDRAM, replace the logic board. Indicates that the computer and the video card are communicating. Read More. Remove and reinstall the SO-DIMM memory modules, located in the bottom of the computer. Go on to the next step. We did not have a power surge or a power outage, but, I was working on the machine installing a couple of SSD drives so I’m thinking that might have had something to do with it. Yes: Your power cord has failed. If your Mac doesn't turn on Press and hold the power button on your Mac for at least 10 seconds, then release it. External devices not recognized. I should have clarified that the external keyboard in question was a PC keyboard whose power button does not boot the computer when shut down. Hold Shift+Control+Option and the Power button at the same time. It may be necessary to carefully remove the hard drive data cable to view the LEDs. Michael Oates. Replace the SDRAM with known-good memory and test. Ernesto Albite. Release all the keys at the same time. 06/08/2016 by Step 3: After a few seconds, press the power button to reboot your Mac. Does the iMac power on now? I ended up replacing the power supply. OK, you dropped a hint here! Verify the power outlet is good. Plug a different device into the socket to ensure there is power, or plug the iMac... 2. This looks like a good answer. on diagnosis procedures, repair, ect. Release all the keys and the power button at the same time. Use a known good power cord. Yes: You may have a loose fit to your power cord. The Computer Will Not Turn On. Unplug and then reconnect the power cable. Yes: The power systems of the computer are working correctly. Press the power button to turn the iMac Pro back on. Fans running loudly and fast. Shut down your Mac. Is there another output voltage other than the 12 volts? Mac runs unusually slowly even with little CPU usage. thanks, 06/07/2016 by Do you hear a boot chime? 9. I have a macbook pro (Late 2011 17" - MD311LL/A - MacBookPro8,3), power button is water damaged (dead). iMac Intel 27" EMC 2309, 2374, 2390 or 2429 Power Supply. I was getting 4 volts from one of the pins and 12 from another one so does that sound like the PSU is ok? 3. Plug the power cord into the iMac and the power cord into the AC outlet. Contacting Apple Support. I'd say that your MotherBoard is dead if the previous reset does not work. Does the iMac power on now? 3. Verify the power outlet is good. imac not turning on It does not come on, no sound, no fan, we get power surges here it has always been on a APC backup power and surge protector. 2. Once it has shut down, remove the power source. Follow instructions in the General Information chapter to reset the SMC. I check the output voltage of the power supply , there is only 12volts in the six wires. Check to see if LED # 2 comes On, comes on momentarily, or stays Off. This brought my I-Mac back to life. John Poen, here is the trouble shooting guide from Apple. See “Diagnostic LEDs” in the General Information chapter for complete instructions on this procedure. LED # 2 is On: The Power Supply is functioning. If the mouse cursor is not moving at all, and the screen brightness / dimming and sound up / down buttons are not working on the keyboard, then the Mac is probably frozen and must be force rebooted. If that doesn't work, search Apple's website for 'reset iMac PMU' and see if you can find instructions for your Mac. there is another six small wire includes the switching for power on button. I can't thank you enough for posting this advice. Fix iMac black screen by power … At 1st, try to plug it somewhere else. To do that : You may know that power supplies on Macs are pretty strong. I have tested the power cable from the power strip to the iMac, it's OK. My first thought is blown power supply. This worked and to bad I didn't see it before for I replaced the iMac. Thought I was looking at a power supply problem. Mac doesn’t respond properly when you open or close the lid. Yes: Your power cord has failed. Does the iMac power on now? I hit the power button and then nothing happens, no more LEDs, no power on, no fan noise, nothing. If both the AC outlet and the power cord are good, replace the AC/DC power supply. iMac Hinge Repair. © 2021 iFixit — Licensed under Creative Commons — Privacy — LED #1 is On: This indicates that the power supply is getting good power from the AC outlet. Once you’ve established that your AC power path is good, it’s time to look at your Mac itself. Edwin Evers, Vincent Monteil 0 Kudos Reply. i have tested the power supply according to several videos on youtube and it seems to be working so don’t think thats the problem. We are installing solar panels and they disconnected our electric power here at my home, without giving me enough time to turn my computer off and unplug from the wall. Press the power button. Shaun Cullen. If it lights up, it's not the outlet. Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2. If the issue persists, replace the AC line filter. Though you may not suspect it, apps could be causing your keyboard issues. I decided to do my own searching and found your feedback. Check the power cord. Here's a diagnostics manual. I hit the power button and then nothing happens, no more LEDs, no power on, no fan noise, nothing. What to do need a network maybe? No responds when you press on the power switch. Using the built-in keyboard, press Shift-Control-Option on the left side of the keyboard, then press the power button at the same time. So I suspect you mis-wired the logic board when you reconnected it after sliding it forward to put in the spare SATA per cable connections. See “Troubleshooting No Video” in this chapter. Remove the memory access door and front bezel to gain access to the four diagnostic LEDs. @oldturkey03. thanks again for the comment. If the LED is ON and there is no image on the LCD display panel, the LCD display panel or inverter might be installed incorrectly or need replacement. 3. iMac Intel 27" EMC 2309, 2374, 2390 or 2429 Power Supply and here’s the guide iMac Intel 27" EMC 2429 Power Supply Replacement. HELP!! If LEDs 1 and 2 are ON and you heard the startup sound, but LED 3 is OFF, then the video card might be installed incorrectly or need replacement. This is especially worth considering if you recently installed an app and then began having keyboard issues. When looking at an iMac from the rear, you’ll see the power button in the lower right hand corner Apple notes in a support document, that the best way to … Connect the power adapter. Or should there definitely be power coming from all the pins on the PSU? 2. Now I have two of them. If the issue persists, replace the AC line filter. thank you for the simple fix, 05/12/2017 by Hold the Keys and Power Buttons Power off the Mac. 07/09/2013 by informative, will need to have imac checked out. Resetting the SMC on an iMac Pro: 1. Faulty peripherals and broken buttons. Then it would not turn on, i tried everything and then called MAC, they never told me to do the steps you have recommended instead, I was told to bring it in to mac and most likely it was my mother board that needed replacement which meant $$$$$! Slight powewr surge at the house last night. 01/19/2017 by Now, press and hold the power button of your system, Command and R keys for about 6 seconds. - Click on save service report button to save the subsystem report. been trying to keep it in permanent sleep mode until now. Plug it in again then wait approx 10s before trying to start it. If all the above methods don’t work out and you still have a warranty with … So I tried using a spare power supply. If your Mac doesn't turn on Press and hold the power button on your Mac for at least 10 seconds, then release. On Macs with MagSafe power adapters, the cable’s LED might change states or temporarily turn off when you reset the SMC. Supplies can fail fully or partially – they may give some power to the fans and such but still not work properly. iMac 27" Vga card with lines and shuts down, look at the youtube oven trick it works!!! iMac A1311 EMC2428 NO POWER! - posted in Mac OS: Dear BleepingComputer, I am working on a clients iMac A1311 EMC 2428. 1. When you’re troubleshooting, always start with the obvious stuff. Resetting the SMC on a Mac desktop: 1. 8. Ernesto Albite, 06/07/2016 by When i restart it does the same thing... 12/13/2020 by iMac hinge damaged causing screen to face downwards. please sir help me thanks.. Had tried plugging and unplugging the iMac with no luck. This LED will be ON when the computer is turned on and the power supply is working correctly. Need info. Sorry if it's a couple years late, but maybe someone else has the same problem. Second, damaged motherboard. The 6 outlet power strip, my iMac was plugged into, was still on, again, untripped, but my iMac will not turn on. Replace the AC power cord. Although Nimesh's answer worked for me, am guessing an Apple keyboard with a dedicated power button (or a simple dedicated external one as linked above) would do the trick. Shut down the iMac. Disconnect the power cord. If both the AC outlet and the power cord are good, replace the AC/DC power supply. I've been trying to work this out for ages. The iMac (20-inch 2007) has four built-in diagnostic LEDs on the main logic board that can help you to troubleshoot the computer. So would you recommend getting a new PSU and seeing if that is the problem or is there something else I can do as a test to see if there problem is elsewhere because the PSU is getting 4 volts on one pin and 12 on another so maybe that’s not the problem? The LED will turn off only if the AC power source is disconnected or the power supply is faulty. I assumed there was enough voltage to turn the light on, but not start the computer. Let your MacBook boot up as usual and the SMC will be reset. 3. Step 2: Then press and hold the power button to turn off the iMac. Here is the fix: 1) Unplug the iMac power cable from the back of the machine (not from the wall or power strip outlet) 2) Push in and hold the iMac power button for five seconds … oldturkey03, " LED #1 is Off: This indicates that the computer is not detecting AC power. !, secondly this problem is over heating and can cause or the cause can be the power cable, i did the via fix and the screen was fine but had some shut downs, reboot fine and the again after checking everything again week later it shut down and was dead , the fault was the main power lead ( ie Kettle lead) had suffered heat inside , i tried my guitar amp power lead and fired straight up, only by chance did i come to this as had this with a marshall amp kept shutting down and over heating due to poor power supply conductivity hope this helps some one the cost under a fiver worth a try first. ". Display brightness not working right. No: The logic board is not passing the Power-On Self Test (POST). iMac Data Recovery. Accessibility. With the back of the computer facing you, the power button is in the lower-right corner. Release the power button and wait for 5 seconds. Indicates that the trickle voltage from the power supply has been detected by the main • logic board. Some power supplies may be adversely effected by being left powered off if they have a defective component. one for the system ssd and another for a spare one that I put under the ODD. iMac G5 systems frequently suffer from bad power supplies. if not, the issue may not be with your Mac but with the external display itself. The four LEDs are located to the right of the memory slot, under the hard drive data cable. John Poen, what are the last three digits of your serial number. If it still doesn't work, wait about 10 seconds, then hold down the power button on the iMac for 10 seconds (this might reset the power manager). worked for me. This was awesome feedback. This iMac was in for a routine SSD upgrade, and then it turned out that the power button was jammed. Backup Your iPad. You may test each of these components before replacing one (of mabe them both). After the 10 seconds have passed, release the keys and power button, then press the power button to power on the computer. Not waking from or not entering sleep. thanks mate i'll try that and get back to you with my results. That will help us to properly identify your computer. If you restarted your iPad, but the power button still isn’t working, it’s time to put … 6. iMac power button stuck repair. I thought I was dead. Use a known good power cord. ... iMac Intel 27" EMC 2309, 2374, 2390 or 2429 Power Supply and here’s the guide iMac Intel 27" EMC 2429 Power Supply Replacement. Installing iMac Intel 27" EMC 2429 Dual Drive Kit (HDD or SSD). THANK YOU! Did you follow the iFixit guides? This LED will be ON • when the computer is communicating properly with the video card. True, you may face a re-stocking fee but that’s the cost of their manpower to test it before they put it back on the shelf. Follow this guide Installing iMac Intel 27" EMC 2429 Dual Drive Kit (HDD or SSD) as I personally find having a static page is better when you are doing the job and use the videos to get an idea on what's involved before I do the job. Shut down the Mac. i have the issue where the #1 LED works but nothing else. Then plug in the iMac, and try again. Has anybody got any clue as to why that would be? I made sure to ground myself to the machine every time I went into it and followed video tutorials on how to take the machine apart etc and put it back together but when I put it back together it just wouldn’t start. Product. Plug a different device into the socket to ensure there is power, or plug the iMac into another outlet. Buying from a store that allows you to return the part if you discover you’ll also need a logic board is what I would do. If you see no change on your Mac, press and release the power button normally. The high performance electronics repair kit. Check the power cord. Verify that the power cord is securely plugged into both the AC outlet and back of the computer. Now release all those keys and the power button at … Who's did you install and how? Indicates that the main logic board has detected proper power from the power supply when • the computer is turned on. Replace the AC power cord and test. Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor. Thank You! sir, where can I find the AC Line filter? Select “Mouse & Trackpad” and look for an option called “Enable Mouse Keys” – uncheck this if it is … The more details may change things here! (Jan 31, 2021) Apple imac power button not working. Press and hold the Power button for 5 seconds and release. 4. @vmonteil. Still it didn't work. Bluetooth and USB ports not working. I am so happy I did, I tried your steps above and unplugged it from the unit and hit the power button for at least 5 seconds and then replugged it and "IT IS ON" thank you! 2. Now release the power button of your system while keeping hold of the said keys and check if you can boot into the recovery mode. iMac dead this morning. There are several things that you may try to fix your problem. After a couple of power bumps to our home's system, and power was restored, all home electrical panel breakers were still in the on or untripped position. Then, try resetting your SMC. Power button doesn’t work well. Does the iMac power on now? The Display Remains Black and There Are No Sounds From the Fans or Drives. Release all the keys and the power button at the same time; Press the power button to turn on the Mac. iMac hinge loose repair. 08/08/2019 by Read More. You saved me a drive to the MAC store and big $$$$. Step 1: Find the circular power button on the back of the iMac. Once it has shut down, press and hold the power button for 8 seconds. 4. It was brought in because it just shut off and would not power on. We did not have a power surge or a power outage, but I was working on the machine installing a couple of SSD drives so I’m thinking that might have had something to do with it. iMac power button not working repair unable to power on. Even still I would replace the power supply first as you need to start some where. So you added two SSD's? Check the connection of the power cord on both ends. Press the power button to turn on the Mac. 2. Reset Your Mac’s NVRAM or PRAM http://tim.id.au/laptops/apple/imac/imac... Press the power for (at least) 5 seconds while unplugged. I have just installed an SSD into the machine and the problems start after that. (but for me I had to also press the battery indicator button every so often - see steps) Unplug the power cord. Press Shift + Ctrl + Option/Alt keys and the power button at the same time. I attempted to follow this advice but having powered down the iMac, removed power cable and drives from the Pegasus unit, then rebooted the Mac, the unit would not turn on at all, either automatically, or by depressing the power button. Your power supply offers multiple lines of power so doing limited testing won’t prove or disprove the health of your power supply. Terms — Apple provides steps for Macs with removable batteries, and the Mac Pro, iMac … Check to see if LED #1 is On or Off. Was dreading having to replace the power supply on my mid-2007 iMac. oldturkey03, wow. the first 3 is for negative and the other 3 is for negative. Thanks for a quick and helpful way to keep me out of the Apple Store! Does the iMac power on now? ok i followed two youtube tutorials. LED #1 is Off: This indicates that the computer is not detecting AC power. On the built-in keyboard, press and hold down the (left side) Shift, Ctrl and Option (Alt) keys, and the power button at... Release all the keys and the power button at … Using the dock Power button to control the system requires firmware-level support within the system, and there's no industry standard for an external power button, so it wouldn't work with a non-Dell system -- in fact not even all Dell systems have support for dock power buttons, for some reason. The LED will remain on even when the computer has been shut down or put to sleep. Michael Sherrard, oldturkey03 @douginton1, Just a thought after repairing my via card (thanks to youtube, the comp booted up then shut down , this happened a few times, after finally double checking all connectors again was fin for a week then on a reboot /start up all the fans kicked in , so let it load and did a shut down, the fault was the power lead , believe it or not, due to the initial problem heat was a problem, the main s lead had suffered , after replacing with my guitar amp plug line (common Kettle lead as i call it) fired straight up , the other issue was slow performance this is now gone, if you have poor power its obvious the rest will suffer, for under a fiver worth replacing , before panicking, seams to be quite common if you have had a previous problem , hope this helps, some one. When you pressed the power button, the button would light up, but the computer would not turn on. Go on to the next step. A good power surge or lightning strike cannot only kill your power supply it can also kill your logic board as well. This LED will be • ON when the computer is turned on and video signal is being generated. Delete Recent Apps. Shaun Cullen, © 2021 iFixit — Licensed under Creative Commons — Privacy — ... Power button not working. This is the adventure I went on to unjam it. At this point in the Power On process, you should hear a boot chime and see that LED #1 and #2 are On. This LED will remain ON whenever the iMac is connected to a working AC power source.