Chosen Solution
Hi, 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?
If you are 100% certain you put the card in correctly and all cables have good connections you probably have the wrong EFI in the computer… especially if the card is not an exact match for the one you removed. Other possibility is wrong extension (aka driver). This one is easier to test. See if you can boot from an install disk (has more drivers - generic drivers). If so do a OS reinstall. If this answer is acceptable please remember to return and mark it.
I have checked the connection to the GPU a million times now. Any thoughts as to what else this could be? Thank you,
Thanks Phillip and everyone else involved with this thread. I was in the same situation as Chris…about to give up after what seemed like a learning process/waste of time. You guys made it a learning process with results! I reseated my GPU for the final time, after loosening it’s mounting screws a bit first, finally retightening the screws and it finally booted up 100% once assembled. BTW, my symptoms after baking my GPU, adding new paste etc, were three diagnostic LED’s only and a completely black screen. Viva las old iMacs! Mine is a mid 2007 20” as well. Cheers to you all and the baking advice and videos.
