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Model A1174 with 2 GHz Core Duo or Model A1207 with 2.16 or 2.33 GHz Core 2 Duo

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Replaced iMac hard drive, now no display!

I recently upgraded the hard drive in my iMac 20" 2.0 core duo following the instructions here. Everything went perfectly. Until I tried to boot back up. Now I have no display. I tore down again to double check my connections but they are all fine. The computer starts up, the light comes on, the hard drive spins, the CD drive spins, but no chime (I had it muted on last shutdown), and no gray screen, just black.

Tried resetting PRAM but no luck, tried booting to Install disk, no luck. HELPPP!!!!

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Plug into an external monitor to see if your GPU has failed.

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Yes mayer, first step then he should check carefully if there's a faint desktop image on the screen. That would lead to a disconnected inverted cable.

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