2.8 ghz prescott intel P4
2X512 geil ram
a newly bought 500w PSU
a newly bought ABIT AI7 uguru mobo
a 40 gb IDE harddrive
a 120 GB maxtor Sata drive
a philips 5.1 soundcard
a radeon X800
a dvd drive
gigabyte cpu fan, 2 vantek case fans
the original problem with my computer was that it wud restart itself almost everytime it tried to boot into windows normally, and then occaisonsly wud boot into windows normally. So i replaced my mobo and tryed to format my maxtor HD, then after the format bar has completed it told me that formatting cud not be done due to a damaged disk or sum other problems. so i bought a new HD (40gb harddrive) and tryed again - it gave me the same error, and then randomly after a several attempts and resitting everything in my computer, it managed to format and install a fresh windows xp.
however the computer then began to generate random errors, even after windows updates and driver installation and appeared to randomly restart and occasionly not boot into windows. I replaced my 550w psu with a 500 w psu, and this appeared to fix the problem, the computer installed all drivers and updated windows fully and ran quite stably.
However i then tried to connect my sata drive to the computer - it started doing the same random restart issues as before. so i disconnected it.
Another problem i now have is that when i put a cd (eg a game) into the dvd drive and click install (tryed many games) the comptuer instantly restarts as it trys to spin the disk in the dvd drive. - it also restarts when i try and run certain applications or too many at once.
At the moment im completly lost as to what is going on with my PC - im swaying toward the PSU ive got now simply isnt powerfull to handle everything in my pc at once - so im going to buy a 650w psu soon. Does anyone think this will resolve the issue? or is there something else that cud be causing all these problems