Well,I  tested the AC adaptor with my multimeter and it's putting out
the advertised 15 VAC, so that is not the issue. Could a wire or some
other power conductor inside have come loose or disconnected? It would
have to be connected to both the battery and the AC adaptor. If so,how
hard is it to get to? I found a web site with illustrated instructions
for disassembling a M45, and the power was about step 30 or so when it
was almost totally disassembled. I'm beginning to dislike laptops.