Help Please !!

My ASUS Probe keeps saying my 12v is out of threshold.. I have no Idea what this means... and my computer continues to restart randomly (I think because of this??) HELP PLEASE I need to get this problem fixed ASAP

ASUS A7N8X Deluxe
AMD 2500+ Barton
Aspire 550W Chameleon PSU (http://aspireusa.net/product.php?pid=25&xcSID=84e8682d65f949d2541fb9e0e6352039)
Radeon 9700 PRO

it's reading your 12v line as either too high or too low (usually too low). you should look into replacing your psu, but if you have a multimeter test the 12v voltage (yellow wires on molex)

I just bought this Aspire 550W.. and it is reading it to high (it is usually around 13.124) ..

I think I might of burnt out my video card thats why my **** is restarting..