IBM Aptiva Series Hardware Maintenance page 84

008 - ARE THERE ANY BROKEN PINS IN THE MOUSE PLUG?
(YES, READ AHEAD. NO, GO TO STEP 010)
− Replace mouse.
009 - DO THE ERROR SYMPTOMS STILL REMAIN? (YES, READ
AHEAD NO, GO TO STEP 005)
− Replace main board.
− End
010 - HAS THE SAME ERROR SYMPTOM OCCURED MORE THAN
ONCE? (YES, READ AHEAD. NO, GO TO STEP 011.)
− Replace mouse.
− End.
011 -
− Exit diagnostic program.
− Ensure mouse driver is properly installed.
− Go to step 002.
Check Procedures 2-31