After using the computer for a few hours (or just having it turned on) the computer will freeze up with the hourglass running and no programs responding. Then, a red stripe about 50 pixels tall will appear across the top of the screen, and the only way I can get out of it is to unplug the computer, wait a half-minute, and plug it back in.
Any idea what causes this and how it can be cured?
Thanks in advance --
Robert