CAUSE: The power supply may be defective.
IMPORTANT: To avoid damage to Macintosh modules follow the
instructions exactly as given in the "CURE:" below.
CURE: 1. Replace the power supply.
2. Turn on the Macintosh and make all Level I adjustments.
3. Run MacTest. If the problem remains, replace the Main Logic
PCB.
4. If the problem remains after step 3, replace the drive.
If the above cure doesn't fix the problem, search on GTS and the
product's name to obtain a general troubleshooting procedure.