Overheated laptop

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It's 6th time My dell insipron 1100 laptop was damaged from overheating
reporting touch pad not working keyboard not working, and funkies with AC
plugged.  All later working good.  Yup back to normal a day or two later.
Overheat isn't produced with battery powered since it limits cpu clock.
I wish I could limit Cpu clock even with AC plugged.  Does anyone knows to
limit the cpu clock or speed?
I found limit the display brightness but not the cpu.
And does anyone know troubleshoot infor with USB ports?  cuz My portable
mp3 and digital sin't come up where usb mouse and keyboard working normal.

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