MB or power supply?

[sohcahtoa]

when i turn on my AVR my system unit automatically turn on even i didn't push the power  button of my system unit, sometimes i cant hear a beep and a display in my monitor but still the fans are still turning on. There's an instances that my PC work properly but after a few minutes all programs that i using will suddenly stop specially when I'm listening music using windows media player.. and I'm trying to push the restart button but i can't hear a beep and has no display in the monitor.. I'm using a asrock mother board w/ 3.06 ghz and a 300 w power supply.. what should i do..? please help me..

[homer]

ummm, whats an AVR?

[patio]

Not sure...but i'm also wondering what version of Windows is running the AVR...

[jerryheavyarms]

ummm, whats an AVR?

I think he is referring to Auto Voltage Regulator.

[dargio]

if you dont hear a beep after starting your pc it could be the motherboard but ypu say that sometimes it starts and after that it goes down so a thing you should check your power suply it could be some conflict there. remove it and let an electronic specialist check it

[sohcahtoa]

i borrow a power supply to my friend but still can't hear beep ad has no display.. and the other problem is my system unit automatically turn on even i didn't push the power button of my system unit..