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Glitchy, crashy, full of bugs, and overall just a bad computer

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Alright, well this is my situation.
A couple of months ago i bought an AGP video card to upgrade from my previous, an Nvidia 7800 gs agp.

Now i've noticed ever since then, these things usually happen:

Computer randomly restarts
Computer randomly freezes

It wasn't frequent at first, maybe it would happen after 4-5 hours of the computer being left on outright, but it has started happening so much more and it is really annoying.

What I've noticed:

85% of the time crashes happen while gaming, usually more graphically intense games such as COD4 as opposed to Diablo 2, it rarely happens when I play d2, but instead it just freezes sometimes, other times its just random crashes/freezes while browsing the web.

50% of the time, the computer freezes while watching videos/movies (youtube/veoh) etc

The crashes happen ALOT more frequently, when i have my PCI sound card plugged into the computer. When i have it removed, it takes longer to crash/freeze

My computer:

P4 2.8 ghz
1 gb ram
Nvidia 7800 GS AGP
random brand Power supply (Not sure how many W)

What i have tried:

Virus scanning/spyware removal, nothing found
Computer is left open with a table fan next to it to try to reduce heating, no avail

I need help to what could be causing this and how to fix it.
Thanks :)
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    Tech Staff

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Hi there,

It could very well be the power supply (PSU). Please post the make/model.

If you don't know the PSU make/model, you can open the side of the case on your tower and have a look. The information needed is printed on a sticker which should be viewable. In specific, post the total watts, and the number of amps (A) on the +12V rail(s). An example of the information needed can be viewed below:

Posted Image

Here we can see (for this example) the total watts is 460W (a bit hard to see on the bottom right side), and it has 2 +12V rails - 16A and 18A.


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