Display stays powered off at boot
Hello,
I've got an problem with my Mid-2010 27" iMac (A1312, EMC 2390, 3.6 GHZ, 12 GB of RAM, HD 5750 1GB).
When I press the power button it starts normally but the display stays powered off.
I tried to check with a light if it was a backlight failure but it's not. The display displays nothing at all.
I also tried to plug in an external display using a Mini Display Port to VGA adapter and I've got no signal too.
So I opened it yesterday and everything seems okay inside (I cleaned it too and now it's clean as a brand new inside).
So I checked the diagnostics LEDs: the #1 is normal, the #2 is on when the iMac is started and #3 and #4 never shine.
So I've got several questions:
1 - Is my GPU totally broken?
2 - How to be sure it is worth the pain to buy a new GPU? Could the logic board be broken too?
Some pictures of the iMac:
Is this a good question?
2 Comments
When you power the system do you get the startup tone?
If you do you know the main logic board is good and your issue is the GPU card.
by Dan
However, I tried to put the OS X 10.6.4 disc inside and I can hear the whole boot process from the DVD. It lasts several minutes and then the drive calms down. Then if I press Enter, I hear the DVD spinning and loading again (I guess it's the language selection menu of the DVD that pauses the drive until the user select its language with ENTER).
by Romain Giovanetti