|"I dont think the HD is fried coz it is still detected in the bios."|
That doesn't necessarily indicate the drive is not malfunctioning.
"not responding' error, with a repeating clicking sound from the HD..."
"the HD in question keeps on making that clicking sound."
That sounds like typical symptoms you get when the drive is dying. When a drive is malfunctioning that can often cause other drives that are connected to the same drive controller to malfunction too, hence why Windows loads fine when you disconnect the problem drive.
There's only a couple of things that could cause you to get FALSE indications that the drive is failing, if other drives on the same computer work fine.
If the problem drive is HD501LJ, it's a SATA drive.
Check your SATA data cables. The connector on each end should "latch" into the socket on the drive and on the mboard, or on the drive controller card - it should not move when you merely brush your hand against it near the socket - if it does, mere vibration can cause a poor connection of it - use another SATA data cable that does "latch", or tape the connector in place.
(There is a slight projection or bump on one side of the outside of the connector that "latches" it into the socket - it's easily broken off or damaged)
The same thing applies for the SATA power connection.
If there's nothing wrong with the connection of those cables, then that drive is probably definately failing.
Check your hard drive with the manufacturer's diagnostics.
See the latter part of response 1 in this:
(thanks to Dan Penny for this link:)
Hard Drive Diagnostics Tools and Utilities
If you don't have a floppy drive, you can get a CD image diagnostic utility from most hard drive manufacturer's web sites, but obviously you would need to make a burned CD, preferably a CD-R for best compatibilty, on another computer if you need to.
If the hard drive itself tests okay, any data problems found can be fixed, one way or another.
If you can't access the drive in Windows or with the diagnostic program, the only way you can get data off of it is to get an expert to try to do that, which is expensive (e.g. most hard drive manufacturers have a data recovery service - see the web site) , or to do what the expert would do yourself, which is cheaper but requires you are handy and are very careful - replace the board on the hard drive, or transfer the disk(s) (platters) inside the drive to another hard drive. Since most of us are unable to find out which board they need, the best bet is to buy a working used drive that is exactly the same model, and try the board from that, or install your internal disks (platters) in that.