I tried resetting the Power Manager to boot with keyboard removed and , of course, the keyboard installed. The Power On switch on the case would not cause a boot. I also removed the backup battery and tried booting with reset of Power Manager. Also tried resetting the Power Manager with Main battery installed and not installed while keyboard and backup battery were out. Same 8-note sour chimes every time. The screen on this machine was perfect and the trackball worked fine the lasat time it ran. It has a 24 Meg RAM chip added and would run AutoCAD R12 renderings and redraws at a workable speed. I hate to just throw it away but facing up to the truth, the truth is that I just about never run it, except to admire what a neat toy it is. I guess all things come to an end someday and maybe today is the Day of the Duo. I wonder if it's worth it to try selling it for parts on eBay? I certainly have enough accessories to go with it. But maybe I would run across an old 270c and be able to make one good machine out of two bad ones. chris