j.sagues wrote:
Many thanks, Sam. What puzzles me is that the iMac had been shut-down and the mains off all night. Hope it won't happen again!

I've seen them do that occasionally. It's a safeguard/reflex if something is uncertain to the mac (I could guess -- maybe markedly different temperature recorded from last info?) -- if in doubt, blast them out as overheating is a BAD THING (that's the technical term).

/ If it doesn't then gradually reduce them/, then you worry a bit more.

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