All these kind of things always related to power supply.
one time before my computer cannot start up normally I transfer it from one
room to another it just goes well;
Another time the weather is wet and computer does not start until I HEAT THE
POWER SUPPLY WITH A HAIR DRIER.

"CHAMI" <CHAMI@discussions.microsoft.com> ¼¶¼g©ó¶l¥ó·s»D:C01B2CC5-3F35-4261-AA50-CEFB7E89A011@microsoft.com...
> My computer started to shut down randomly which I thought it is after
> installing a video card NVIDIA 6600 GT and my power supply is 450Watt and
> I
> had total of 4 fans running including the CPU FAN, VIDEO CARD FAN and two
> more extra fans. I removed one extra fan and now I have total of three
> fans
> including the video card , cpu and the blow out fan! So the problem is
> when I
> turn on the computer, when it comes to windows xp logo screen, computer
> shut
> off itself sometimes even before!
> Then I have to turn off the back switch of power supply and turn back on
> before computer started up. I plug the power code directly to the wall,
> then
> it seems kind of went away but not sure because it happens so randomly.
> However, same thing I noticed one of my friend's computer. His computer
> shuts
> off as soon as it turns on and he also has to unplug and wait 4 minutes
> before plug the power code back in and start up windows. His computer
> also
> randomly shut off itself. Sometimes, working real good without even turns
> off. So I cleared the BIOS in his computer also as I did in my computer,
> still having the problem. It is impossible to think that ACPI is having
> problems because my friend bought the computer about an year a go maybe
> and
> he said that this is started to happen after a while so we can assume that
> it
> did work correctly for a while. He does not know much about computers to
> change stuff in BIOS etc...
>
>
>
> ALTHOUGH MOST OF THEM THINK THAT VIRUSES OUT THERE CANNOT INFECT
> MAINBOARDS,
> IS THERE A POSSIBLITY THAT A VIRUS CAN RUIN YOUR MAINBOARD, ELSE WHAT
> MAKES
> ALL THOSE COMPUTERS RANDOMELY SHUT OFF ITSELF IF VIRUSES CANNOT INFECT
> MAINBOARDS OR IF A VIRUS INFECTED A MAINBOARD, HOW DOES IT MAKE THE
> COMPUTER
> SHUT OFF ITSELF ONCE IN A WHILE INSTEAD OF ALWAYS ARE THE BUNCH OF
> QUESTIONS
> STILL HIDDEN IN THE MYSTERY AND REAMIND TO BE ASKED!
>
> I REALLY APPRECIATE EXPRESSING WHOEVER THAT HAPPENS THE SAME PROBLEM,
> THUS;
> WE ARE ABLE TO COME TO A CONCLUSION THAT IS IT A MAINBAORD THAT IS
> INFECTED
> BY A VIRUS OR IS IT SOMETHINGELSE THAT IS HIDDEN!
>
> ALSO, REALLY APPRECIATE WHOEVER GIVING IDEAS WHERE WHAT NEEDS TO BE FOCUS?
>
> THANK YOU ALL!
>