PC Gets restart !

[81adityakumar]

Few DAYS before i have bought a Sapphaire ATI 6670 with 1GB DDR5 . I have been noticing that 
1.when i use my PC for normal use (Surfing net, Listing songs etc.) it works fine.
2.when i use to play games (having sound output via Speakers) and by chances if power cut's off the PC gets restarted.
3.when i use to play games (having sound output via headphones ) it works perfectly in the case of power cut also .

NOTE:- I am using UPS till my inverter gets UP.
PC Config :-

1. Processor- INTEL Core 2 Duo E7400 
2. Motherboard- Intel DG41RQ
3. RAM- DDR2 4GB (800 MHz)
4. Power Supply Unit- INTEX 450W
    PLZ HELP ME .I have also tried a UPS which is good in condition and works fine but the problem still consists.  

[Enderman]

What are your GPU temps at load.

[guas5373]

My guess is the power supply. I used to have a crappy power supply that would restart my computer would restart as if it was starting up from a cold boot. Hope this helps.

[Deletive]

My guess is the power supply. I used to have a crappy power supply that would restart my computer would restart as if it was starting up from a cold boot. Hope this helps.

that system is pulling like 250watts max

but could be a motherboard problem.

[81adityakumar]

Guys plz read the situation carefully (which i have mentioned).............. :huh: