This is obviously a stupid question, but here goes: I have a laptop (PC) and desktop PC, and all I ever hear from them is a soft clicking sound. I think that this is the hard drive or some form of loading sound. My desktop just starts clicking for no reason whatsoever, even when I'm not touching it. Does an SSD make this sound? Btw. I'm looking at getting a Mac and wondering about the SSD option. If I went for SSD in the Mac, would I be noise free? A friend has a 2009 iMac 2.66GHZ with HDD (no SSD) and theirs makes the 'loading' sound as well. Thanks a lot.