Mac startup without mouse
How do I start up Mac without mouse
How do I start up Mac without mouse
If your existing mouse is no longer working, you can use just about any generic USB mouse with your iMac.
If your keyboard is working and you need to login, then you might be able to use the arrow keys to get to the login panel.
The easiest method is to turn off the login without the password. Use https://support.apple.com/en-us/HT201476 for instructions.
Mac startup without mouse