I'm not sure if this a software or hardware problem. I'm running Windows XP Home and I'm leaning toward a hardware problem. For no rason what so ever my computer just shuts down and not just off, it goes into a mode where I have to unplug it to turn it completely off, just to get it back on again. I have run every type of spyware and anti-virus product. My hijack log is clean and nothing can be found. Sometimes it happens every few minutes, other times, like now, I can get up to a half hour or more. I never know. It started out happening only once in a while, maybe every couple of days. Now its many times day. There is no error message, no clue, no warning it just goes into this type of lock down mode. Don't know what to call it. I have no idea where to start. I tried the Windows XP repair, that didn't work. Could this be a corrupted file or is it a power regulator problem? Any help is appreciated. Many thank in advance.