Hi all
Yes i did it too, after halloween party took my drive and laptop back upstairs and......
you guessed it. Plugged the 20v laptop supply into my Maxtor 320.
Removed cover and drive, slaved to desktop

( no joy )
Confirmed Pcb faulty.
Removed TVS diode.
And now traulling internet for replacement PCB control board.
Anyone out there who can supply the following model.
Seagate Barracuda 7200.10 320GB
FW 3.AAE
SN 9RV04HCJ
ST 3320620A
PN 9BJ04G-305