|First check if your BIOS is detecting your hard drive.|
If it detects it then you will need to run a HD diasgnostic
test for your Hard Drive model. Go to this website to find the
appropriate HD diagnostic tool.
If your HD is a SATA drive then just connecting it to another
computer would make it work, if it is an IDE Hard Drive then you
have to make sure the jumpers are set to slave drive if the other
computer already as a master hd or set it as cable select if
the other hd is set to cable select (take note that the master
slave in cable select is always connected to the end of the IDE
ribbon and the slave to the middle connector).
Again if the bios does not "see" the hard drive...
unplug from the wall anytime your going to open the case...
replace the data cable and unplug and replug the power cable...
plug in again and see if the bios "sees" the drive
unplug and remove the drive and slave it to a working computer
using the slave or cable select option if its a IDE drive... it has
to be the middle connector unless its on a second channel by itself...
power up that computer...does windows see the drive...if so copy
any data you can't live without to the other drive or burn it to CD/DVD's...then run chkdsk /r on that drive while you have it connected to the working system...
if the working computer does not see the drive its dead and will have to be replaced...
Hopefully you have your data backed up somewhere .