I have an old Gateway 600 Mhz P3 that I leave on all of the time. If I turn it off, it won't reboot unless it sits for a while. For example, if the power goes out, it won't start up right away. I can hear the fan and drives spin, but the monitor will not power on. Sometimes it will work after being off for 5 minutes, sometimes it has to sit much longer. Does anyone have any idea why this might be happening and what I can do to remedy the problem? Thanks.