Constant shutdown after a few minutes/seconds

I Just bought a Brand new Mini-itx ZOTAC NF610I-K-E

Running with a pentium 4 Socket 775 (sl8hz)

So it start it and it runs okay for about 2-3 min then it shuts down, after that every time i try it it last a little bit less. like

1st time : 3min
2nd time : 20 sec
3rd time : about 5 sec
and so on

I have no idea what the problem is.

can any of you guys help me ?

if you have any question about my problem, fire away
 
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