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Well shucks, I booted it up this morning to see if it had cured itself over night and being Sunday morning, it was absolutely quiet around the house, but the computer was not. A very faint chattering noise I had never heard before. Tracked it down to the memory banks. Pulled them and replaced them and the machine booted up.
Amazing what modern tech can do.
However, in the process of checking the disk in the 600e, I seem to have managed to screw up the 600x disk. All I get is a schematic diagram of the upper keyboard with a floppy disk with arrows pointing here and there. So I will try a startup disk and see what happens.
BTW, the 600e disk works perfectly well in the 600x. Another scientific mystery, no doubt.
Anyway, thanks for the suggestions. As the screen showed the memory active, I would have never looked there.
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