After going into sleep mode, my Compaq PResario 5030, purchased in 1998 (P2 333Mhz) often doesn't want to wake up completely. If sleep mode has been a short nap, it's not really a problem. But if it's been several hours, the video will come back on, but it's black background with white mouse curser which doesn't move. I have to restart with the restart switch--soft boot doesn't work. Do I have a mechanical problem with the hard drive, or could it be a power supply problem? I don't seem to have other problems that would indicate either.