Computer freezing constantly

I've been experiencing issues with my computer freezing up lately and would like to know whether it's because my PSU cannot handle the components.

Issue: Computer freezes randomly- the screen and application is frozen, and move cursor cannot be moved. Sometimes the computer will last 2 hours, sometimes 2minutes. It has been sporadic as it freezes while under heavy load from games, music, movies or even sitting idle. Also, a high pitched noise comes from the the PSU when frozen.
Yesterday I changed the PSU to another with similar watts (because the store didnt have any higher) to check whether my PSU was faulty. However, no luck there.

My system specs:

Graphics Card - Gainward GTS250 1gb "Deep Green"
HDD - Western Digital Caviar Blue 500GB [...] riveid=301
PSU - Silverstone 500W [...] eport1.pdf
CPU: AMD x4 965BE
Motherboard: Asus m4a79xtd evo [...] templete=2
RAM: 4GB Gskill DDR3 1600

Gainward's site says the minimum required watts is 500 which is what I'm using.
I ran a GT220 which requires 300W and the computer ran smooth. I'm looking to change the graphics to a ATI 5770 to see if the issues lies with the graphics card. Will my current silverstone PSU handle it? ATI's site says minimum requirement is 450W.
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More about computer freezing constantly
  1. the ati radeon hd 5770 is better than the nvidia 250, but uses a more efficient design, thus less power. it should work.
  2. Would the PSU be able to handle another 500gb harddrive?
  3. Still going with this one eh? The GTS250 doesn't need 500W, that's just the safe range. If you tried everything from the last thread I helped you in, take the GTS250 to a PC store and ask them if they can do a test with it to make sure it's all working. The PSU can handle another 500Gb SATA HDD pretty easily.
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