Try other usb port, or other computer and see whether the hdd is detected. If still not, try to go to device manager ( http://www.computerhope.com/issues/ch000833.htm ), and then assign a drive letter to the hdd. After that, try to access it from Computer, if not able to access it, format it (use quick format) and then use this program to recover your files.
http://www.asoftech.com/adr/

Hi there,
What did you mean by not run?It doesn't show up in 'my computer' when you plug it into your computer?Or it can be detected but you can't open it?
If it shows up in 'My Computer' as a drive letter(like E: drive) but you can't access it,I would first try to recover the target="_blank">http://www.any->If the hard drive can't be detected,you can try this way.Put the hdd in a zip-lock bag and put it in the freezer overnight. Then while it's still cold plug it into the computer and you may be able to view it in 'my computer'. And run the recovery program to recover your >If it fails, you will have to go to a recovery office but let's hope not because it will cost you a lot of money and whether they can recover the >How To http://www.dbuggr.com/marcwilliams2011/recover-lost-data-crashed-hard-drive/