Gateway LX6810 BIOS and fan issues. Help!

I have the GT5628 and the fan speeds up at random intervals then reboots. Sometimes the fan speeds up while I shut the computer down, and then does not completely shut down (ie it freezes up during shutdown). I have even replaced the motherboard. I blow dust out of it and the power supply fan at least once a month so it's spotless clean inside. What is causing this and what can I do.
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More about gateway lx6810 bios issues help
  1. have you tried reinstalling the OS ?
  2. I did better than that: I installed Windows 7. I didn't do the upgrade, either, I did the full install
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