Machine turns itself on all the time

Hi - Ive installed Leopard on 2 of our machines - the iMac, which is (mostly) okay after the transition, and my partner's Mac Mini. The Mini turns itself on every day despite the fact that none of the schedule options are set. It is on the network, although the setting to "wake" for admin is not set. (Im not sure what time it turns on - it's always already on by the time I open the office at 8.30 am). Im now way too put off Leopard to install it on my iBook - apart from the millions of bugs and glitches Leopard has, making my iBook Tiger my only stable machine, I really cant afford to have a charged laptop turning itself on all the time!
Any ideas?
Thanks,
Rod

You might try resetting the PRAM and power management unit of the computer. To reset the PRAM, hold down opt-cmd-P-R on boot until the thing chimes twice, then release the keys and let it boot normally. To reset the power management unit on the Mac Mini, follow the instructions on this page: http://docs.info.apple.com/article.html?artnum=300574

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