TI-58C not powering up

[Andrew Varney]

I have recently dug out my previously (40 years' ago!) much loved TI-58C calculator. I used it a lot in my school days, then got a replacement battery in 1989 but after that it was put in storage for 30 years. When I plug the power adaptor in, the calculator does not even display. As I remember, it used to be able to run on the power supply even when the battery was flat. Not sure if the reason is that the battery is beyond /just/ flat after 30 years in storage, if the power supply adaptor is not working (I've checked fuse, but don't have another calculator to check it on), or if there is some other reason.

Has anybody else experienced something similar and/or can suggest further checks and how I can make them?