Hello Lenny,There is a possiblity the power supply in the external hard drive enclosure has gone bad. No need to worry. A simple plan you can do if you plan to save your date is simple. 1. You will first need to buy a hard drive docking station. This is an example of one i use. Here. I would suggest getting one that supports all 2.5" & 3.5" SATA HDDs up to 1TB. I bought mine from Tiger Direct.2. You will need to first remove the actual hard drive from its enclosure. An example can be found here. 3. Now that you have removed the hard drive, plug the docking station to your computer to install proper drivers and insert the hard drive you removed from the enclosure.4. You'll be able to access the information that pops ups through the docking station.Hope this helps. Enjoy. Let me know if this works.
The data is still on the disk but can you get it is the issue.
If the logic board is still good and the drive is recognized by bios that it is do able. But if the drive is not recognized, you may need some recovery service. If you really want your data, don't format since that erases all and makes a recovery operation even more difficult and expensive.
Bottom line - it is always prudent to have backups of backups for obvious reasons..
If this is an external drive remove it from the shell and connect it directly to computer. Might be the electronics in the shell that have gone bad!!!!!!!!!!!!!!!