Strange shutdown and restart behavior

[agoodpop]

My PC is behaving badly when doing a shutdown or restart. Used to work fine. When I do a shutdown, it goes thru the windows shutdown cycle. Gives me the shutting down screen, screen goes blank, but PC never turns off. I have to hold down the power button for 5 seconds even though BIOS is set to instant off. Same behavior for restart, so PC never restarts. Gets stuck at the shutdown and I have to power cycle. I have reflashed BIOS and checked settings. If booted from DOS floppy, power button works as instant off. If in Windows (even Safe Mode) above behavior.

AMD XP 2500
1 GB memory
Jetway N2View MB (nforce 2)

No overclock, standard settings

Any thoughts besides rebuild? Thanks

 

[pradeep1]

Could be some problem with the motherboard and the soft off feature. Also considering trying another power supply unit. I know some older PSUs will not work with modern ATX motherboards properly.

 

[agoodpop]

Case and Power Supply are only 6 months old Antec True Power.