Black screen after video card replacement.
I bought a new video card from a reputable dealer (Macpartsonline) and followed the advice on this page iMac Intel 20" EMC 2133 and 2210 Video Card Replacement up to step 38, because the new video card had a heat sink attached. I replaced the video card unit and reversed the steps. Now when I start up the computer I hear the chime and fans whirring, but get a black screen. Is there some cable I didn't reconnect correctly?
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