PC restarts automatically after shutdown

[kkeng]

Hi ALL,

Whenever I shutdown my windows os, the process goes well till the poweroff stage, but after a second or two it gets powered on automatically and starts to boot.
Right now I'm disconnecting power through the powerswitch behind the smps. Any clue whether its a fault in SMPS or motherboard.

I have a coolermaster extreme power 390w smps, Biostar TPD35D2 mobo. I verified the frontpanel connectors several times with the manual to ensure that the switches are connected to proper source. The system is stable always and no disruption in power even in case of fluctuations.
help me to shoot out this problem.Thanks

[Disc_Junkie]

Right click My Computer >> properties >> Advanced >>Startup & Recovery and in System failure box uncheck Automatically restart and press Ok...

Check this site too:

http://www.microsoft.com/windowsxp/u...l_02may13.mspx

[kkeng]

Thanks but my problem is nowhere related to software, looks certainly something to deal with h/w. Regardless of the os I run the system goes powerred off completely but gets power then by some means. Updated Bios with the most recent firmware but no luck.

[RMN]

my old system use to switch on auto due to a bad PSU