CAUSE: The pins on the logic board punch holes in the mylar
covering on the RFI shield on the back of the logic board. When
they penetrate the covering they short to the case.
CURE: 1. Install the latest revision of RFI shield orderable through
Apple Service.
2. If the problem persists, replace the external drive
mechanism.
3. If the problem still persists, refer to the Level I Technical
Procedures.
If this cure does not resolve the problem, go back to the Word Search
screen and search on the product's name and HTS and GTS to obtain a
General Troubleshooting procedure.