Hi everybody, I recently replaced the PSU out of my friends computer because it died on him, and now he says it's randomly freezing/locking up on him. It happened apparently while watching a movie, so nothing demanding at all. Before I gave it back to him I tested it through Prime95, Heaven Benchmark, Cinebench, Furmak, and OCCT. I had 0 stability errors, nothing at all temps where all perfect. I updated all drivers and windows updates, cleaned out the system from dust, cleaned the registry, I even tested the RAM through memtest and it was also good. Now he gets it and says it's freezing on a movie?!?!? I have no idea what's going on or how to fix it. So any help would be greatly appreciated. The specs are the same as mine except he's running stock clocks on CPU (3.4ghz), and his video card is a GTS450 instead.