Left Mouse Button Won't Work

[Zac67]

Sounds like a contact problem (which may be in the mouse cable or the port). Taping it into working position will only be a temporary solution, a more permanent fix may require repairing/exchanging the port. You can check the buttons of the mouse including cable with a simple multimeter and a piece of wire.

A short like motrucker mentioned shouldn't damage the CIAs right away if it isn't left on for extended periods.

[Zac67]

You can fix a broken cable by cutting off the damaged end and replacing the plug with a new one or reattaching the cable inside the mouse, depending on which side is faulty. However, it's highly recommended to make sure it's the mouse in the first place...

[Zac67]

Well, you can also use a joystick - it's button closes the same contact as the left mouse button.