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13

If the NumLock indicator in the upper right corner of the 
keyboard does not light when the system powers up, or the 
keyboard does not work: 

 

Check that the keyboard cable is securely attached to the 
system unit’s keyboard connector. 

 

If possible, substitute another keyboard that is in good 
working order. If the substitute works, your keyboard 
may need replacement. 

If your mouse pointer does not move or moves erratically when 
you move the mouse: 

 

Check that the mouse cable is securely attached to the 
mouse connector on the system unit. 

 

Disassemble the mouse and clean the roller ball.