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1 Black Screen iMac 27
Hy ,
I have an Apple iMac "Core i5" 2.8 27-Inch (Mid-2010)MC511D/A.
When I press the power button i have a black screen, the fans are spinning, backlight working, you can hear the gong. How can I diagnostic a faulty motherboard or a faulty video card? I have already tried with an external monitor, but no signal.
Any ideas ??
Update 12/17/16
Caps Lock LED on wired keyboard doesn’t light when pressed.
I have checked the Diagnostic LED's and all 4 are on. LED #1 + LED #2 + LED #3 + LED #4 = Power available, system is powered on, video card found, and internal LCD found. If the fourth LED is not visible after power on:
- Verify cable connections between LCD panel and logic board
- Inspected LCD display cables for cable damage
- Verify external video functionality, and according to result check the following items:
- If external display works then verify/replace the LED backlight board
- If external display works then verify/replace the LCD panel
- If external display does not work verify/replace the logic board
Please, any suggestion what should I check before changing the logic board. I still suspect the graphic card .
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Either aim a flashlight into the screen at a sharp angle are you able to see a faint image of your desktop? Or try using an external display any image on it?
из Dan
Hy ,
I have already connected to an external display and no signal , with a flashlight can't see anything .
из Raul