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Is my new cheap psu freezes my computer?

Last response: in Components
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July 19, 2012 1:39:42 PM

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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a b ) Power supply
July 19, 2012 1:45:04 PM

It sounsd like you know what the problem is, and I agree, an unstable power supply. So whattaya gonna do about it? Hmm?
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July 19, 2012 2:07:31 PM

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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July 19, 2012 2:29:15 PM

Dont connect that 200w power supply , it will explode and probably take the motherboard with it.I have seen that happen !!!
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a c 158 ) Power supply
July 19, 2012 2:33:02 PM

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.
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a c 158 ) Power supply
July 19, 2012 5:35:55 PM

What's your budget?
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a c 158 ) Power supply
July 19, 2012 5:55:57 PM

The Coolermaster GX 450W is actually well reviewed by a reputable review site and is made by a very reputable OEM, Enhance Electronics: http://www.hardwaresecrets.com/article/Cooler-Master-GX... It is more than sufficient for your system and has sufficient power for an upgrade to a modern PC with a moderately powerful GPU (i.e. HD 6850 or GTX 550ti).
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July 20, 2012 2:17:59 AM

OK, i found the one you suggest and it's about 85$ here! I'll keep that in the top of my list, are the RS series not good enough! thanks
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a c 158 ) Power supply
July 20, 2012 11:17:52 AM

The RS are a low quality PSU...they're cheap for a reason.
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July 20, 2012 11:58:46 AM

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.:-)
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a c 158 ) Power supply
July 20, 2012 12:22:05 PM

The 200W PSU would work for the system if you use onboard grapics instead of the 6200.
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July 20, 2012 12:26:51 PM

but I'm very afraid. it's my sister's PSU and if anything happen to it, my funeral :-)
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a c 243 ) Power supply
July 20, 2012 12:27:00 PM

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
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July 20, 2012 12:31:37 PM

Thanks, i'll try as soon as she left her PC :-)
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July 22, 2012 1:01:56 AM

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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July 29, 2012 3:57:06 AM

Best answer selected by prasad rangana.
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