shards of graphic doom fill the screen
I've postponed dealing with the display issues for several years by using SMCfancontrol, but am now in the same boat as previous posters. 2.16Ghz white imac A1207, shards of graphic doom fill the screen, over heating happens swiftly, and it just won't run anymore. I've done one take apart and clean out, hoping it would help, but no joy. Trying to locate replacement parts in advance of a deeper look inside, but having trouble finding what I need, although powerbookmedic.com has quite a nice inventory. Wondering if it's the inverter, rather than the GPU. The guide I'm using is here - iMac Intel 20" EMC 2105 and 2118 Repair
Small variances in build from those steps, but nothing too tough as long as you take your time. Reassembly is tricky though, really do stop and get all the freaking tape out of the way, it'll spare you some misery.
Is this a good question?