Computer swithces off on its own

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Hey,
Can someone please help me with this problem.
Every time I use my computer for some intensive work like rendering a video my computer switches off automatically. However this doesn't happen normally. It only happens when i am converting a video from one format to other or rendering something. I have already installed 2 fans. Also got my processor fan cleaned up. I have a 1.5GB ram,Pentium 4 D865GBf board.
Please help me sort this out.
Thanks.
 
Start by running Memtest86 to test your memory. What is the power supply's wattage rating? This may be a power supply issue too...
 
Video encoding is one of the most cpu intensive tasks out there. If you run an over clocked system, it is a good indication of a bad/unstable OC.
 
these are the temp readings:

motherbard: 38 degrees
cpu : 40 deg
aux: 52 deg
hard disk :48 deg

cooling fans
cpu: 4131 rpm

voltage values
cpu : 1.46 v
 
Memory test:
Physical memory: 1534 mb
swap space :2156 mb
virtual memory : 3690 mb

Ram: 2nos
1. 512mb ,166mhz
2. 1024mb,200mhz
 
1.46 v-core? Have you tried running your system at normal clock-speed to see if the problem is still there?
 
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