Technical information

Troubleshooting Symptom/Cure Tables: System Problems After Startup - 50
Cursor Problems
This section deals with a cursor that moves on the screen, but clicking the mouse has
no effect or double-clicking the mouse does not open an application, disk or server.
Possible Cause Possible Fix
Corrupted PRAM. Reset parameter RAM. Hold down <Command> <Option>
<P> <R> during startup but before “Welcome to Macin-
tosh” appears.
Corrupted system soft-
ware.
Boot off the system CD that came with the unit. Does the
cursor work now?
Yes: Reinstall system software. (You must use the
system software CD that came with the unit to get the
correct version of Mac OS.)
No: Go to next step.
Bad USB port on the key-
board.
If the mouse is connected to the keyboard, connect the
mouse to one of the USB ports inside the iMac I/O panel
instead. Does the cursor work now?
Yes: Replace the keyboard.
No: Replace the mouse.
Bad USB port on the iMac. If the mouse is already connected to one of the USB
ports inside the iMac I/O panel, switch it to the other
USB port. Does the cursor work now?
Yes: Replace the logic board.
No: Go to next step.
Bad mouse. Replace mouse.
Bad logic board. Replace logic board.