When connecting two new 1T Maxtor HD's to my computer, I incorrectly connected my older Maxtor drives to a power source of 19V 3.16A, believing I had the correct connector.

Now, neither drive can be recognized by my Macintosh Powermac G5 Dual 2.0GHz system. The discs do not spin up and, on the OneTouch III Turbo 1T EDA-9MP4A6
(S/N 2CAD0XHP), both the power cord LED and panel light flash intermittently. On the 250 GB OneTouch II EB250G0060101
(S/N B6139LFH) the front panel light does not light up at all.
I am interested in knowing the possibility and likely cost of repair for the controller cards or their replacement in these drives.
Maxtor does not offer either a physical repair service nor replacement parts.

Is there anyone in this forum who can provide this service, or who can recommend a technician?