DesignJet T770 SATA HD | Fast Delivery

The defective part may be one of the following:

1. Defective Hard Disk

2. Defective Formatter Board

3. Defective Main Board

4. Defective Fan

5. Defective Control Panel

Replacing the HD and\or Formatter Board is easiest to trouble shoot.

Replacing the Main Board and\or Fan is time consuming with dozens of screws to remove and reassemble.

I can't personally confirm the Control Panel fixed it. Never got to #5 on the best guess list.

Watch this youtube video to demonstrate how to remove and replace. One of the easiest parts to replace ever.