Thx for ur replies!
I have no idea what is my PSU, how can i check it?
and i aint sure its becz there isnt eough power cuz it doesnt always restart the computer keeps on running only the screen went off.
Well, i recently bought a geforce 6600 gt for my intel pentium 4 2.6 mhz.
When i tried playing some "old" games or games that dont take much like warcraft 3 or counterstrike the geforce did its work and worked very good but when i tried playing some new games like prince of persia or guild wars...