User Guide

Troubleshooting Symptom Charts/ Cursor Problems - 35
Cursor Problems
The cursor moves on
the screen, but
clicking the mouse
has no effect or
double-clicking the
mouse does not open
an application, disk
or server.
1 Reset parameter RAM. Hold down <Command> <Option> <P>
<R> during startup but before “Welcome to Macintosh”
appears.
2 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.
3 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.
4 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.
5 Replace mouse.
6 Replace logic board.
The mouse
occasionally loses its
ability to track in one
direction.
1 Clean the mouse. The USB mouse contains a ball that must
remain clean in order to roll properly. In addition, there are
several rollers inside your mouse which can accumulate
debris. If either the ball or the rollers are dirty the USB
mouse may not track properly. Refer to the Tech Info Library
article # 6491: “How To Clean A Mouse.” If cleaning doesn’t
solve the problem, go on to the next step.
2 Unplug and then re-plug the mouse into the USB port. If you
find that unplugging and re-plugging the mouse into the USB
port restores functionality of the mouse, it’s possible that
the mouse is broken and may need to be replaced. Contact
Apple for assistance in getting the USB mouse replaced.
USB Printer Problems
iMac cannot print to
an attached,
known-
good USB printer.
1 Does the unit have the iMac Update 1.0? Ways to tell:
- Run Apple System Profiler. In the Device screen, the USB
version number in the upper left corner should be
greater than 1.0
- Do a Get Info on the OS ROM file in the system folder.
Under the name, it should be “iMac Update 1.0” or
greater.