CPU usage spiking to 100% after buying a new PSU Hi. I need help... My system's PSU went bad, and I just bought a new PSU to replace it. According to the place I bought the new PSU at, the 5v circuit died (they tested it). I used to have an Enermax 420w PSU, and I replaced it for an Echo Star 680w PSU (specs here.) I know, it's not the best quality, but I needed the PSU urgently so I could get back to work - otherwise, I can't make money to repair the system! Well, now that I installed this PSU, I'm getting very random CPU usage spikes when browsing the internet (using Firefox 2.0), when I watch a video, or when I do anything 3D related (such as a game, or DirectX's internal tests). I reinstalled the video card drivers, and the motherboard chipset drivers... and I still get the same problem. Could this be caused by the cheapy PSU? I checked the voltages in the bios and they're not ... right. (+12v shows as +11.6v, and so on.) My motherboard is an Abit NF7-S, running an Athlon XP 2500+. Thanks for looking at my question.