For some reason when my mac is at the login screen, moving my external USB mouse will cause the cursor to only move up and down. Once I am logged in, the mouse functions normally. Does anyone know the reason/fix?
Steps I have taken:
- Reset SMC/NVRAM
- Reinstalled OS
- Tried another USB Port
Late 2013 15" MacBook Pro running Yosemite 10.10.3
with iHome wireless USB mouse.
I tested it and mouse works fine without problems on my Windows PC.