You probably destroyed some components in the power conditioning
circuit on the board. They're most likely surface mount, so you
won't be able to fix it yourself. A 66% overload is pretty
hefty, and a lot of supplies put out more than their rated
voltage until they're loaded down.

Boba wrote:
Ok, I hooked my Toshiba 40 gig gigabeat, MP3 player up with the wrong
power supply. It's rated at 3 volts 2.2 amps.... the power supply he
used was 5 volts 3 amps.

Now it won't even turn on.... is it "Fried" ?.... or is it possible
that I just killed the battery not the hard drive?