Mouse directions didn’t work on the Amiga 2000. The mouse was fine as it was tested on another machine. Another mouse was plugged in the Amiga 2000 and it didn’t work either.

Testing:
-Mouse buttons works.
-Joystick works in both ports.
–5V not present in pin 7 on both ports

Problem was a fuse in the PCB near the joystick ports located at F1 position. It’s a fast acting 4 amps pico fuse. Replaced with a new one and problem fixed.