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モデル番号A1225 / Early 2009 / 2.66, 2.93もしくは3.06 GHz Core 2 Duoプロセッサ

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Black screen no backlight no boot chime

I just bought a 24” iMac for parts or repair that I'm trying to fix.

When I turn it on the disk drive still checks for a disc, the fans still spin. When I disconnect the temperature sensor they still start spinning really fast. 3/4 lights on the motherboard are on (from what I understand this could mean a faulty display or graphics card) but they are both in very nice condition.

There is no boot chime (this could be because I don't have a hard drive installed) I understand that it won't boot to anything without a drive present but from what I understand it should at least show something on the display.

I've heard that a similar issue to this, but then on a MacBook Pro was fixed by holding down the eject button on boot but for some reason none of the USB ports are outputting any power so I can't use the eject button on my keyboard. It really feels like it's fully functional but that i just can't see it as most basic things required to start up the computer are functional. I'm willing to try anything as I don't mind if I break it further (it was only 25 bucks) but I'd really like to get it to work again if possible.

I've also tried booting without any RAM installed and then rebooting with a single stick installed because I've heard that that works, but that didn't change anything either.

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You need to check the onboard diagnostic LED’s

Block Image

LED #1 - Indicates that the trickle voltage from the power supply has been detected by the main logic board. This LED will remain ON whenever the iMac is connected to a working AC power source. 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 source 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 #4 (third) - 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. Note: this LED is not used on systems with the integrated graphics.

What are they telling you?

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My board has 4 leds and only 1,2, and 3 are on.

さんによる

Then your graphics board has failed

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from what i see it could also be the lcd panel. but it seems more likely that it is the power supply as usb ports are not working either. i will double check the graphics card though, thanks for the suggestion!

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jimmy_neutron さん、ありがとうございました！
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