Intermittent start up problem

Sometimes our Mac mini just does nothing. The cable to the PSU is hot. I tried resetting the PMU and even pulled out the logic board battery to reset that too. Still doesn't work.
Then a wee while later it does start up.
Any ideas? There don't seem to be many problems with them but this one stumps me.
aedan

hey, this might not be the most helpful advice, but hey. Ive had the same problem with my mac mini, and i have phoned up apple many times about it. Run an extended Hardware test from the discs that came with it, repair disc persmissions stuff like that. If that doesnt do anything (like mine) take it to an apple repair shop. Do you have applecare?

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