Sharp Wizard 64K stopped working

[addieblue]

My Sharp Wizard 64K stopped working after 30 years. Unfortunately, phone numbers for all my business and personal contacts are on it.

The sequence was this. I got a message that I needed to replace the operating batteries. I did that, and it worked fine. Then I noticed that I had not screwed the back plate on securely, so I opened the back plate again. When I screwed the plate back on, the device did not work and I got a weird message about the memory. It didn't specifically say to replace the memory battery, but in desperation I did so.

Still doesn't work--screen does not respond to the "on" button.

Would be enormously grateful for any suggestions.