I'm having trouble with my HDD Western Digital Caviar Blue 500GB. I've checked its status and it hasn't got any bad sectors, it shows me 100% health on Sentinel.
Generally it's in silence, but when moving the CPU a bit, it starts producing a click sound.
I have a little feeling that it could be the power source, because I touched it once without connecting it and the computer turned off.

I could made a backup of the data on the my other HDD, but when I try to copy something to this Western Digital, it begins clicking and it's veryy slow.

Here's the audio (it's very clear even without headphones): Vocaroo | HDD Western Digital Click