*note I am NOT a big fan of eBay personally for anything but junk computers with other issues besides mine to get parts from, so that's why i linked to amazon*
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change the enclosure and you'll be able to reuse the drive too
First, I'd consider buying another power supply and try that now if it's not more then the enclosures I listed for a desktop harddrive
here is a disassembly [http://www.youtube.com/watch?v=6FlySnyJ0CQ|video]
You likely damaged traces on the board in the enclosure if you tried a new power supply, so your only option now is HDD enclosures
take this drive apart and find out if it's sata or ide
a SATA connection
http://en.wikipedia.org/wiki/File:SATA_Ports.jpg
IDE
http://en.wikipedia.org/wiki/File:Ata_20070127_002.jpg
check your drive(s) in the MyBook enclosure and compare them to those pics
Next, pick your enclosure(note I picked ones I feel are well priced and have good star ratings already, pick your own if you want to)
[http://www.amazon.com/Rosewill-RX35-AT--Aluminum-External-Enclosure/dp/B004K4TE5O/ref=sr_1_8?ie=UTF8&qid=1329014451&sr=8-8|SATA]
[http://www.amazon.com/Rosewill-RX35-AT-IU-Aluminum-External-Enclosure/dp/B004BU6ITW/ref=sr_1_3?ie=UTF8&qid=1329014564&sr=8-3|IDE]
*note I am NOT a big fan of eBay personally for anything but junk computers with other issues besides mine to get parts from, so that's why i linked to amazon*