Thinkpad 390E - No Mouse Found

[CDobyns]

Have a long-time reliable Thinkpad 390E, and recently rebooted it and got the O/S message after Windows loaded that no mouse was found by the system.

Have not had any problems and even replaced the entire keyboard a couple of years ago - so suspect it's not the trackpoint mouse. Tried to get the system to recognize an external PS/2 mouse (which it has recognized and responded to in the past), but no luck in getting the O/S to sense the mouse device.

Thinking that some inadvertent hardware configuration setting problem might have occurred, I used my Go Back to go back to a time interval where the system trackpoint mouse was working - but no luck. Is this some sort of sudden system/hardware failure? It seems strange that neither the trackpoint or external mouse is being recognized though. Any suggestions?

[CDobyns]

Still looking for any recommendations on the mysteriously disappearing mouse message.

Took the step of pulling the keyboard and checking the ribbon connectors. As far as I can tell those are all solid. And again, the keyboard itself is really only 3-4 years old, since it was last replaced..

Will entertain any suggested directions. Thanks.