My G5 iMac sometimes shuts down after minutes or seconds?
My G5 iMac (A40338) shuts down sometimes, just goes blank/dark. When it happens its from a few seconds to several minutes after powering up. Seems to have happened on our hottest days (circa 100F recently) though still 80F inside. I vacuumed out and used can of compressed air on the fans and whole board, but saw no obvious dirt to remove. I have thermal compound remover and replacement but don't know where the heat sinks are. I see no bulging capacitors on the board, or anything obvious astray. Am I on the right track?
Is this a good question?