Random reboots

[andregoujon]

Hello people,
I'm having some problems with random reboots. I think it's PSU because I tested memory, hard disks, video card, processor)...
I've Restart automatically option disabled but not BSOD is displayed and no record of error in Event Manager).
The problem can happen when listening music and using Microsoft Update but I can play new games 3 hours without problem.
In the motherboard's manual, I read that it says: A 450 W or more is highly recommended for system stability".
Mine is 350 Watt PSU that came bundled in my Case, brand Cooler Master, Elite.
Is this random reboot problem related to PSU? Can be this a fail sign from chipset or motherboard? It have about 3 months old.
Windows XP, Memory, Processor, Video Card, Hard Drives are trouble free, I'm sure.
I'm not sure about PSU or if motherboard is working ok or is defective.
Thanks!

System:
- XP Pro SP2 Spanish all patchs and drivers
- AMD Athlon 64 X2 3600+
- MSI K9N4 SLI/NVIDIA nForce 500 SLI Chipset Based
- SAPPHIRE Radeon X1550 (128 bit, 512 DDR2)
- one SATAII Seagate 160 gb, ATA100 Seagate 20 gb and Sony CD/DVD RW
- Kingston DDR2 667 1 GB each one

-Temperatures are normal.

 

[phantom93]

it probably is because being underwattage can casue that, Try booting xp in safe mode with networking and download windows updates (cant listen to music, no sound in safemode) BTW a 500watt PSU doesnt cost alot, i bought my 500 Powerspec for $50