A bas PS caused an 80GB Seagate to start smoking and was removed from my computer. When plugged into another computer it would not even spin up and the computer will not POST with it plugged in. On closer inspection what I suspect was a zener diode was cracked and burnt, so I removed it assuming it was a TVS diode and while the drive still does not spin up, the computer will POST. Is the board permanenetly fried or did I remove the wrong diode? The diode I removed is almost dead center on the board in the picture below right between the 3 pin power supply to the spindle motor and a torx screw. should I try removing more diodes? Thanks in advance.

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Angel Data Recovery

One of these days we should ask NASA to help locating the origin of this epidemy of 'diodes' , 'tvs' and 'BIOS' ( ? ) .

"BUF" is indeed a 12V TVS diode.

Your board does not require a chip transfer, so a straight board swap may be your easiest remedy.

Otherwise you could take a few voltage measurements with a multimeeter, but it may only be a post mortem exercise.

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A backup a day keeps DR away.