Working on a Gateway Box w/ Win ME installed, Problem began w/ system locking up during operation. Owner tried and failed to use restore disk. Now it refuses to boot at all. Opened case and it was full of dust, cleaned it out and tried swapping HD with one that I know is ok and same problem. Thought CMOS battery was low changed battery no change. It displays message that CMOS date and time not set and directs you to hit f1 to change settings, but hangs there. Any suggestions?