I used a 19V laptop A/C adapter on a My Book 500 GB, and it started blinking nonstop with an audible clicking. It continued to blink when I used a USB connector, and the blinking stopped when I used FireWire, but the drive would not power on.
After trolling this board, I have deduced that I tripped the 12V safeguard when I used the 19V adaptor. I have read that the D4 diode is the likely culprit, but I’ve never tinkered around with diodes and Torx screws before, so I wanted to put a picture up here before I do anything too drastic. Many thanks in advance to this community for any assistance you can provide.