Apple performa 400 series Servicehandbuch

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 Troubleshooting
Symptom Charts/Peripherals - 9
 
Peripherals
 
Works with internal 
or external SCSI 
device but does not 
work with both
1 Verify that SCSI select switch on external device is set to 
different priority from internal.
2 Verify that external SCSI devices are properly terminated.
3 Replace terminator on external device.
4 Verify that terminator is installed on internal SCSI drive.
5 Replace SCSI select cable.
Cursor does not move
1 Reboot system.
2 Check mouse connection.
3 If mouse was connected to keyboard, connect mouse to rear 
ADB port and disconnect keyboard. 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.