CaptainChunk
macrumors 68020
I'm pretty it's a relay in the PSU clicking on, as well. My Mac Pro does it and so did my old G5.
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What's that click noise when waking or turning on?
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PurpleLogix
macrumors member
I have it to on my MP 06. Always had it, normal to me and i like it cause i can tell when it goes to sleep.