342Alyssa524 :
Are you sure your hard drive is till well?
Why not try to use a diagnostic tool to test your hard drive, such as Seatools?
As to your saved data on this drive, you may need ad data recovery programs. Nowadays, there are many data recovery programs that could easily get back the inaccessible data from a "not formatted" hard drive.
Go search for a drive data recovery freeware over the internet.
After regaining your needed data, you could try to format this drive and see whether it could work as before.
I hope you also could learn to back up your needed data from this trouble.

I do
NOT recommend searching the net for free data recovery software, this is one of the best ways to get a virus.
Seatools for DOS is a great recommendation if the drive is made by Seagate or one of its child companies.
S.M.A.R.T. Tools:
Seagate & Samsung: http://www.seagate.com/support/downloads/item/seatools-dos-master/
Western Digital:
http://support.wdc.com/product/download.asp?groupid=612&sid=3
Hitachi: http://www.hgst.com/support/downloads/
Recovery tools:
http://www.sysresccd.org/Download
(use Testdisk to check for recoverable problems and SmartMonTools to check the physical health of the disk, PhotoRec to recover data if the drive is toast.)