If you have checked the connections, and you are sure they are fully seated on both ends, your hard disk has failed. Replace the disk and install operating system, programs, restore data backup, etc.
I assume you have tried a different pw connector and data cable. If not, you can give that a try.
A forum community dedicated to tech experts and enthusiasts. Come join the discussion about articles, computer security, Mac, Microsoft, Linux, hardware, networking, gaming, reviews, accessories, and more!