Computer randomly shuts off

[gf4200isdabest]

I just bought a new video card and i've been having major issues

I have an MSI k8n neo-4 mobo with a amd64 3000+. I have a COOLMAX CX-450 ATX 450W Power Supply that I bought off newegg a couple years back. I just bought a new Radeon 1950XT to replace my old 6600GT. When i put the card in, my comp started for a second and then lost power. I couldn't get it to turn back on. I tried a new PSU, that didn't help. Returned the new PSU and bought a new mobo (same kind), that worked. Since then, every once in a while my computer will just shut off while it's running. The power button will be non responsive and I usually have to unplug the computer, flip the PSU power switch, wait a couple seconds, and then turn it back on.

What do you think the problem is? Is my video card defective? is my PSU unable to handle the stress? something else? Is there any good way to test what's happening?

 

[sniperruff]

well what is the new PSU? i won't trust coolmax.

 

[doggyfromplanetwoof]

You can test the PSU loads with a voltmeter, you can buy one at walmart for like 8 bucks. According to the cool max site (http://www.coolmaxusa.com/productDetail...ures&subcategory=120mm&category=single) It has more than enough rails for your specs. Could be defective though.

 

[Puffnstuff]

My guess is the ps is too weak. Go guy a name brand quality ps that will hold up under use.

 

[gf4200isdabest]

Originally posted by: sniperruff
well what is the new PSU? i won't trust coolmax.

I returned the other PSU once I realized I had fried my original mobo so I never got a chance to try the new mobo with the new PSU.

The thing that's weird is that it hasn't yet died under stress (as in, running a game or something). It seems most likely to die within a few minutes of when the comp has been powered on.

 

[sniperruff]

Originally posted by: gf4200isdabest

Originally posted by: sniperruff
well what is the new PSU? i won't trust coolmax.

I returned the other PSU once I realized I had fried my original mobo so I never got a chance to try the new mobo with the new PSU.

The thing that's weird is that it hasn't yet died under stress (as in, running a game or something). It seems most likely to die within a few minutes of when the comp has been powered on.

i think the entire computer (esp the video card) needs a lot of power when it starts up. i notice my x850pro's fan whirs when it starts up.