PC Peripherals 3rd Time Power Fail on My Computer

HI, this is very frustrating, my pc power fail 3 rd time. what the exact problem with it.

I have a P 4 @ 2.24 Ghz, 1 x 512 & 1 x 256 MB SD RAM, Gagabyte Motherboard, 2 x 80 GB IDE, 1 x 160GB IDE, 1 x DVDRW IDE, Inbuilt TV Tuner, Netgear Wireless Adapter, Inbuilt Lan, Audio & Video.
I am ran all the component with 400 Watt SMPS.

but this is 3rd time my pc again not get on.

What the exact solution for this.:mad:
 
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