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Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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Faulty GPU or Logic Board?

Hi,

i have an issue that i do not understand. After a Lightning my imac stopped working. I can power on and ear chimes but no screen , neither with an external monitor. Thinking the video card was broken, i have cooke my GPU in the oven (The gpu is an Ati HD 2600 Pro). I did this successfully a lot of time before but this time did not work. Now if i attach my GPU on the Logic Board The three leds are flashing but no boot at all. No chimes, no fans ecc... The strange think is that if i remove the GPU from my Imac it boot! I can ear chimes, hard drive, optical and fans. O_O I would like to know if the problem is the logic or the gpu. If is the gpu, can i upgrade with an 8800 GS from another imac ???

Sorry for my bad english and thanks to everybody that would like to help me ! :)

Best Regards from Italy, Alessandro.

Answered! View the answer I have this problem too

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If putting the GPU in the machine halts or effects the boot it's obviously faulty. The LEDs should be on steady not flashing. See this Answer about upgrading / swapig the GPU.

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Thank you ! I really appreciate your help ! I buyed a new card on ebay to give it a try !

Hope everything will go fine !!! :)))

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Alessandro will be eternally grateful.
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