PowerBook 145b Keyboard and Mouse not Working Shortly After Bootup

Hello there,

I have an old PowerBook 145b, when I boot it into System 7 it works fine until after a few seconds the keyboard and mouse stop working. So I can't click anywhere or type anything, but the trackball itself works fine as I can move the cursor around. The amount of type until it stops working varies: It will take ~5 seconds if I leave it sitting idle but if I use the mouse, continuously clicking as fast as I can I can get it to work for 30-45 seconds before it stops clicking and typing. I'm not sure if this is a hardware or software issue. Any ideas what's wrong?