Well after switching the power supply in my mates PC with mine, and it now working fine, it seems to be that (Not Artifacting). The thing is, the PSU Tester that I have says its fine. Could it still be a faulty PSU?
absolutely. You need a multimeter in addition to a tester while the computer is under load. In any case, PSUs are relatively cheap. replace it before you burn out your system.
