hello. i'm having a few problems with this new computer i'm putting together. specs: mobo: intel D845GVFN proc: intel celeron D 2.66 ghz 533fsb ps: 400w hd: maxtor 120gb cd: sony dvd-rom basically, the computer boots, but then turns off about 30 seconds later. when i start it back up, it tells me it turned off due to overheating. yes, the fan is seated properly on the processor. i just don't want to fry the mobo. any suggestions?