|"I have a bridge board but when I hook the hard drive up to the computer nothing happens. The computer will not even come on."|
What do mean by a bridge board ?
If you were using a proper SATA to IDE adapter, it won't make the computer not boot even if you hook up the IDE connection backwards.
The mboard not booting, and the mboard booting but the hard drive not booting are two different things.
There's probably nothing wrong with the external drive enclosure or the hard drive inside of it, unless you dropped the external enclosure, or it fell. .
Troubleshooting USB device problems including for flash drives, external drives, memory cards.
See Response 1:
Check that out first.
Rarely, not all the ports on the back of a desktop case may be able to supply 500ma each.
If you have a desktop computer, Note that I answered a Topic on this site recently where a guy had an external drive, which does require the full 500ma, connected to a port on the back of a desktop case - it would not work properly when a webcam was in the port next to it, but it worked fine when the webcam was unplugged. Ports on the back of a desktop case often have two ports connected to the same USB controller module that are ports one above the other - you could try connecting the cable to one of those and leaving the other un-used.