Strange Clicking Noise?

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Hey,

Sometimes I get a strange like, click noise from my pc I have no idea where it is coming from, but it's making me wonder why it is happening, anyone have any idea what it could be?

 

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I'm not sure what it is, and what is an RMA?

It's like, a click, but, not a normal click, I don't know how to describe it, I will when I hear it again.

 

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Oh ok, well, thing is, the HDD came with the PC I bought, so will that actually cover it?

It's been happening for a while and I haven't had any problems I can tell of, I might try and record it making the sound, although I'll be recording for a while :/