How can you debug sudden freezes and restarts? Only overheating?

My iMac, under Win XP via Boot Camp, will freeze and restart unpredictably when playing games. I thought I had tracked it down to overheating, but it's not that simple. Is there any error logging at the BIOS level with Boot Camp or any record when it shuts itself off and restarts? I think it must be BIOS and/or hardware, since there are no Windows events that seem to be related. If it was a video or audio driver crash problem, wouldn't I get a BSOD and some sort of error log (since I have automatic restarting turned off in Windows)?
Does anyone know more about when the iMac hardware will trigger a restart due to heat issues? I thought I had solved this by using smcFanControl on the Mac side to bump up the fan speeds and then tracking it with SpeedFan on the Windows side. It worked great for 2 nights. Then the 3rd night, it crashed and restarted right away twice, and then played fine for an hour or more. The 4th night, it crashed and restarted 3 times in a row, within minutes, and we gave up, somehow restraining ourselves from tossing the Mac out the window onto the sidewalk.
According to SpeedFan, the first time it crashed, CPU temps were only at 16C, HD at 37C, and overall at 35C. The second time, CPU temps had gotten up to 25C. The last time, CPU temps again were only at 16C (i.e. it crashed so fast, we hadn't even started playing, so it was effectively idle). Other temps remained pretty constant the whole time.
Given all that, it's hard for me to believe it's a matter of overheating. Yet I have no idea what else it could be, or why upping the cooling seemed to fix the problem for 2 days, and then the next day we were back to square one.
I guess Boot Camp should come with a big sign, only for word processing. What a waste of time - everything else Windows I do in Fusion. The one thing I wanted to bother with Boot Camp for is almost impossible to do, play a simple, not even new or state of the art game. I'm at a total loss what's happening, now that my overheating theory seems to have blown away.

Hi. I just wanted to tell you that I have the exact same problem, only I've got a Mac Pro. Unfortunately, I don't have a solution for you, but I posted details about what I've found here: http://discussions.apple.com/message.jspa?messageID=7217936#7217936.

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