Mac Mini crashes - NOT A KERNAL PANIC - just reboots

I posted this same info a couple days ago, but nobody responded, yet I see others getting their crashes responded to.
I have a Mac Mini Core Duo and have added 2 Gig of Omni Tech. memory recently. Everything pretty much works okay, except that playing Big Bang Board Games Reversi makes the mac reboot at random times. It is NOT a kernal panic. It simply powers itself off and back on, rebooting. I don't get the screen where you get told (in multiple languages) to reboot. It simply goes "BOOF!" and it powers off and on.
These reboots happen only in a few strange situations, but not in regular applications like Safari, Thunderbird, or even GarageBand. I can surf all day in Safari, literally, for over 12 hours. Then I go to Reversi and two plays later, "BOOF!".
All memory tests show my memory is okay, which includes:
Memtest from Memtest.org,
TechTools CD from the AppleCare package, and
Apple Hardward Test that comes on the original Disc #1 DVD with the mini.
All of them show no errors with the memory, nor with any other hardware.
Any suggestions?
Duck
Mac Mini Intel Duo Core Mac OS X (10.4.7)

Hi MrDuck,
It sounds like you may well need to reset the 'System Managament Controller'. There is a fairly straight forward guide on how to perform this procedure written here - http://docs.info.apple.com/article.html?artnum=303446 . It's absolutely nothing to worry about, the likeliness is that your system needs to be 'refreshed' to work with your new hardware if you like. It should do the trick.
Hope that I may have been of help
-Pos

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