iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

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Screen goes black if VSync cable is connected?

Hi everybody!

I've got the following issue: after replacing my broken VSync cable the iMac's screen stays black.

If I detatch I have an image, but of course without the sync cable attached it flickers from time to time depending on the image displayed.

Any thoughts on that?


Answered! View the answer I have this problem too

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Connect to an external monitor. If you have a video problem it's your VGC (VGU).

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Well, as I mentioned, the inbuilt display is working if I detach the sync cable, so the VGC / VGU seems to be fine. But thanks anyway!


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Josua will be eternally grateful.
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