First thing that pops into my mind is a broken fan on either your cpu or gpu. Open your case, turn your pc on and check if the fans on either work
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Kamisorix has the sex appeal of a NXS
PSN name: Gazz1979 (feel free to add me)
Currently playing: Battlefield 1943 (PS3), Battlefield 2 (PC) and Wipeout pure (PSP)
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