Okay, So I got a Dell. A mistake I've realized now. Anyway, my system fan fried a while back and I had the motherboard/ram/video card/system fan/powersupply replaced. Ever since Dell replaced the parts, the USB ports have not worked. I have tired everything. Bios, drivers, chipset drivers and all that jazz. Dell wants me to reformat. I told them that I will not do it and lets go to the next step. There should be no reason why my USB ports would not work on a fresh install of XP Pro the same day I got the new motherboard. It's not my hardware I'm connecting either. I have a USB mouse and it works on the PS2 connection. I've tried all the ports too, nothing works. Anyone have any idea of what it could be? I am certain its a hardware fault. There is no reason why my second harddrive or new OS(XP from the ME I bought the comp with) would cause any problems. I have until January to resolve this problem. I feel like going out, buying a new case, mobo, and processor(I have the old style P4) and video card(32mb currently). Does anyone have any ideas of what it could be?