Hard drives can last a long time and sometimes they fail.
If your computer is under warranty, contact Dell Tech Support.
If not, if you live in the United States, Request Backup Disks USA if in another Country, contact Dell Tech Support in your Country.
Original poster, If you have solved your problem, can you please mark the correct thread(s) with your solution. Thanks
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#MicrosoftMVP - Windows Expert-Consumer April 1, 2012 to March 31, 2015
Be careful buying drives in EBay - refurbished/recertified/used drives are inherently dangerous purchases, and may sellers will ship OEM drives (which carry no manufacturer warranty).