Task manager shows up to 60% CPU usage with none of the programs on the list using it. System Idle Processes still says 99, even with the CPU usage at 60%. It's unlikely it's a software problem, as I've tried a format and a different harddrive. I'm wondering what types of hardware problems could cause something like this? I'm thinking it might be the RAM, but I'm not sure. btw, this problem happened over night, with the computer running normally(left on overnight) and acting up in the morning.