computer randomly reboots unknown cause....

[SwearBear]

my system has been acting up sporadicaly i dont know what is causing it.
1. computer randomly reboots ill be surfing the web or just sitting there and it will l reboot out of no where then sometimes after it just rebooted it will do it again sometimes one after another.
2. lock ups in computer games then reboots as well
i'm not sure if its my motherboard processor or power supply or a cooling issue

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System Specs:
AMD 1.333ghz
Ausus A7m266 rev 1.04 (have not flashed the bios yet to the latest)
256mb of ddr pc 2100 ram from crucial i have another stick but i think it got jacked up some how or its the slot
300watt antec power supply
Sound Blaster Audigy Platinum (latest drivers)
Radeon 8500 (latest drivers)
Maxtor 40gb 7200 rpm harddrive
Yamaha 16x burner
Creative DVD rom ovation 16x

 

[John]

If you have NT/2K/XP check the event viewer

Try swapping with a know good power supply

reseat components

 

[boyRacer]

Ahhh... i had to go through this crap recently. Mine was getting worse and worse so I reformatted my system. I put my cpu back to 1Ghz but couldn't change the vcore as i had it wire tricked. Anyway... in the middle of installing Windows it would restart at exactly the same spot... ok... out goes the ram for a new one... nope... out goes the video card... nope... out goes my ps... which was really annoying because this i just swapped my old 350w with a 550w... nope... so i thought it was my RAID array... since my cpu was at default speed i figured it cant be my cpu. but guess what? it was... so i had to take out the wire trick and then put it back on... big hassle i tell you. i should've just raised the voltage in the first place.

 

[toant103]

my computer did that. The problem is my video card. Some of the ram is bad. Switch video card, work perfectly