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Power light is on, however screen remains blank, intel imac (mid 06)

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I assume you have one of apples ATI cards. Try removing
card and resetting it. I have had problems with apples ATI cards before. I currently have a problem with a 22" screen which says it it out of range on the mac but boots up fine under windows. Also look at the buttons on your screen and see if
you have one that says 'auto'. This is suppose to reset the screen. Try using the screen on another mac or a windows pc.
and see if you get any video. Your ati card may be bad.

Posted on Oct 01, 2009

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Posted on Jan 02, 2017

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Imac intel will not power on


Possible failed video card. 3rd LED indicates MLB and GPU are communicating: (CAUTION! There is high voltage from the powersupply so any attempt to open iMac other than removing glass panel to see the indicators...should be done by authorized ACMT)

  • LED 1 - Indicates that the trickle voltage from the power supply is detected by the main logic board. This LED will remain ON while the iMac is connected to the AC power. The LED will remain on even when the computer has been shut down or put to sleep. The LED will turn off only if the AC power is disconnected or the power supply is faulty.
  • LED 2 - Indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.
  • LED 3 - Indicates that the computer and the video card are communicating. This LED will be ON when the computer is communicating properly with the video card. 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.
  • LED 4 - Indicates that the computer and the LCD display panel are communicating. This LED will be ON when the computer is turned on and video signal is being generated. 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.

Aug 01, 2017 | Apple 24" iMac Desktop

1 Answer

MA878LL iMac 24" core 2 duo 2.4 do not turn on,


Checking the power supply isn't the easiest thing to do, it involves pulling apart the entire machine.
You can try resetting the SMC, unplugging all power, hold the power button for 5 seconds, replace power, then attempt to turn on.
if it still won't turn on, and assuming you didn't get AppleCare or it is expired (past 3 years) it might be worth taking in to an Authorized Apple Repair Facility and see if they will check it out for free. If it is under warranty, most definitely take it in or call 1-800-APL-CARE
If neither of those are an option, Power Supply http://www.ifixit.com/Apple-Parts/iMac-Intel-24-Inch-2-4-2-8-GHz-or-3-06-EMC-No-2211-GHz-Power-Supply/IF169-002
a tear down from iFixit for the 20" model, it is most likely very similar for your model as well http://www.ifixit.com/Guide/Repair/Installing-iMac-Intel-20-Inch-EMC-2133-and-2210-Power-Supply/1006/1
Hopefully that helps. Good Luck

Feb 23, 2011 | Apple MA878LL iMac with 24" Screen Desktop...

1 Answer

I went to sign on chatroulette on my imac and it is showing a black screen...but when i am in photobooth it works fine.. how do i fix this?


1. Make sure than no other Apps are using your iSight camera. Quit (not just close) all other apps that a running. There should be no 'lights' under any of the dock icons apart from your web browser and finder.
2. Reset safari settings. MenuBar: Safari---> Reset Safari

2. (If still not working) Update to the latest version of flash player (adobe.com). relaunch browser
3. (If still not working) Right click blank screen and choose 'flash settings', make sure you 'enable' webcam use.
4. (if still not working) try another browser (Chrome/Firefox)

Jan 23, 2011 | Apple iMac (20 inch, Mid 2009) SuperDrive,...

1 Answer

Blank screen when switched on


The CRT may be blown, or the circuitry for the CRT is awry.

Jul 10, 2010 | Apple iMac M6709LL/B Desktop

1 Answer

Power up IMac but screen blank, fan on, light on but no response


I have one doing exactly this at the moment. It had gone to sleep and the fans were going like crazy. I think it is a Motherboard failure (it happened with many G5 iMacs), this one has been replaced once already, and I can't actually get it to install anything. I'm taking it apart tomorrow to see what I can find inside. If I fond anything I'll let you know.

Aug 07, 2009 | Apple iMac G5 Desktop

1 Answer

My imac 0s 10.5.7 goes blank and restarts mid work. I thought maybe a mouse problem so took off the wireless and put on the one that came with the imac. That didn't solve the problem.


It sounds like either a hardware problem that has been shown up when you installed Leopard, or your Leopard install hasn't gone smoothly.
IS it a new install?

Jul 22, 2009 | Apple iMac 24-inch 2.8GHz Intel Core 2 Duo...

1 Answer

IMac Intel wont boot


It sounds like you need a new motherboard.

May 06, 2009 | Apple iMac G5 Desktop

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