Ticking noise from PC

I get a similar noise at times on my PC, sort of a electronic tick, not mechanical sounding like a clock. I could check my fans but I've thought until now it was a harddrive. It doesn't happen consistently so it's a real pain working out where it is coming from!
 
Some hard drives do it when they get older. I have a Barracuda somewhere that sounds like a cement mixer whenever it reads/writes. It doesn't throw up any errors and appears to be perfectly healthy, but my god is it loud. It was silent when new, it must be over 6 years old now.

My hard drives in my current PC make barely audible read/write sounds now after 2 years, when they were first put in, they were also silent.
 
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