iMac 2009: screen goes black, logicboard of graphic card at fault?
I tried to upgrade the CPU on my imac 2009 27" (EMC 2309). It was a blunder because after I put back everything, the screen goes black within a few seconds after power on. Sometime the screen stays until the login window appears, sometime during the boot progress bar, sometime just right a few seconds. I can still connect to the imac from a laptop. When I plug an external monitor to the imac, the login window appears on the external display as usually.
I thought it's because of the new CPU, so I put the original CPU back. But the problem remains after that. It seems I broke my imac? Is there a way to find out what is broken: the logicboard, the graphic card, or the board on the display?
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If you still have the original Grey CD/DVD's find the one that has the diagnostics and try to run it.
из Dan
@tonyh2 "When I plug an external monitor to the imac, the login window appears on the external display as usually" have you checked to see if it is your backlight that turns off? In a darkened room shine a flashlight against the screen and see if you can make out the desktop. Have you reattached the LED thermal sensor?
из oldturkey03