Apple lc 520.550.575 Servicehandbuch

 

 Troubleshooting

Symptom Charts/Peripheral

 

 (Continued)

 

 - 14

 

Cannot double-click 

to open application, 

disk, or server

1 Remove extra system files on hard drive.

2 Clear parameter RAM. Hold down <Command> <Option> <P> 

<R> keys during system startup but before “Welcome to 

Macintosh” appears. 

3 If mouse was connected to keyboard, connect it to rear ADB 

port instead. If mouse works, replace keyboard.

4 If mouse does not work in any ADB port, replace mouse.

5 Replace logic board. Retain customer’s SIMMs.

No response to any 

key on keyboard

1 Check keyboard connection to ADB port.

2 Replace keyboard cable.

3 Replace keyboard.

4 Reset PRAM.

5 Replace logic board. Retain customer’s SIMMs.