|The hard drive may have failed, in which case you need to remove it and install a new one. To test if it has failed, use a working PC which has a CD/DVD burner and download SeaTools for DOS by clicking "Downloads" on this page: http://www.seagate.com/support/down...|
Then download and install IMGBurn from here: http://filehippo.com/download_imgburn/
Using IMGBurn, create a CD from the SeaTools for DOS ISO file.
Now boot your faulty PC from that CD & SeaTools for DOS will eventually open.
Select the drive to be tested & test it with the long/extended test.
If it says "Failed" at the end of the test, you need a new hard drive.