I have a desktop computer with windows xp installed ......everything was working fine until i restarted my desktop and all of a sudden it would freeze up at the windows xp load page....it wouldnt unfreeze no matter what i did i even tried safe mode and same mode with command prompt and it would freeze........i then unplugged my usb mouse and usb keyboard from the desktop and then my desktop loaded up without a problem ....any ideas what happned? i have a 600 watt power supply i dont think it was my power suplly pls help.