boots to bios and shuts itself down (when no OS loaded), why? HP NC4010

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My HP Compaq nc4010 occasionally shuts itself down when I reboot the OS
after using it for a while (when it POST's and starts the OS so it's
the bios which does that), any clue why and how to fix this?

It will boot after a few minutes, maybe it becomes too hot or something
: (

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