Topic: <http://groups.google.com/group/imaclist/t/8366c7114d2db1ee>issues with Core Duo imac
Before you start taking your iMac apart, be sure to vacuum out all external air-circulation vents, particularly the circular inlet on the rear under the support arm. That inlet on my G5 iMac (last of the breed, which has the same case as yours) was almost completely matted with dirt that caused various display problems after the machine had time to warm up. Cleaning this inlet (and a bit of dust in the RAM-access region behind the removable panel at the bottom of the computer) restored the machine to normal behavior -- no trouble whatsoever for the past year.
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