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Is my new cheap psu freezes my computer?

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My old 450w psu burned with a little explode and bought a new 400w psu,(it is said 400w but there is only 325w) and first 2 days it worked like a charm and I worked continuously more than 4 hours, and in the third day, it started, my computer freezes randomly, sometimes in the bios and in the grub boot menu (i use more than 1 os, ubuntu 10.10, 12.04, kubuntu 12.04, winXP, win7) and it stays still (not evading blank or shut down). I checked my bios, and found out that 3.3v is low and now it shows 2.96v. I checked this psu on another PC and the result was same. sometimes this pc works like there is no problem at all but some time it's a nightmare. is this because faulty PSU or motherboard/CPU problem? these are my specs

Intel pentium 4 HT 3.06 1mb LGA 533fsb
Asus p5pe-vm mobo
1GB ddr1 200mhz (512+512)
Asus nVidia geforce 6200 128mb AGP (currently using DVI port)
Hitachi 500GB sata HDD
LG Dvd ram
Mercury Combo (and have 3 additional fans to cool down)

Please help :sarcastic: 

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mmm.. I should buy a new good PSU soon (cooler master for sure) but I want to make sure it, I have a 200w psu (actually a PSU of acer apire one t300 ) and can I try it on this? I think it's not enough with wattage, i'll only connect the MB. is it okay to do that? thanks for your reply, i'm new here and you replied me first!
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Power supply Master

If you go with Coolermaster, then stay away from the Extreme Power Plus line; the only PSUs that I would consider from CM are the Silent Pro PSUs.

As far as trying the system with the 200W PSU; I would try it without the graphics card and if it is stable ith it, then I might add the graphics card. The 6200 is not a power-hungry GPU.

I've tested them too, swapped ram, swapped vga, used on board VGA, but the problem exists, I couldn't check CPU cuz I haven't any LGA 775 cpus here and couldn't check my PC with another PSU cuz I only got 200W PSU and some said it's risky,

Okay Rugger, i'm gonna but gx 450w psu, thanks for your guidance.:-)
Power supply Master

Prasad Rangana said:
I've tested them too, swapped ram, swapped vga, used on board VGA, but the problem exists, I couldn't check CPU cuz I haven't any LGA 775 cpus here and couldn't check my PC with another PSU cuz I only got 200W PSU and some said it's risky,

Okay Rugger, i'm gonna but gx 450w psu, thanks for your guidance.:-)

I've seen Dell GX280 SFF system's, with the same specs as your system, run for 7-8 years with the thier little 180 watt psu, it's not that risky

Bros,I think I found a suspect!, I am running my computer using ubuntu 12.04 live version right now without connecting the hard disk and now the system runs fine!, It's a sata HDD, is this the same power supply problem? is it risky to continue working like this? or is the HDD malfunctioning? it's only one year old! thanks
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