I am having a serious problem with my Windows 2000 laptop. Every now and then, it just won't start... it goes to a red dialog box before loading Windows stating: Hard drive not installed, reinstall operating system. I am unable to reload anything because it will not boot even to a command prompt. When I unplug it for a good while and restart it again (plugged-in) it starts fine. Sometimes, I get a STOP ERROR: KERNEL STACK INPAGE ERROR 0X00000077 and occassionally, this ERROR: 0200: Fail fixed disk. But, when I wait again to replug and restart it, it starts fine. The laptop is in very good condition. I just recently gave it all of the Windows updates and ran Norton System Utilities completely without any error messages. I hate to think that this is a real laptop hardware issue with the motherboard, circuitry or BUS. Any ideas of what this could be?