Hodsocks:
For some odd reason that noise that you described isn't coming from your speakers, but rather your secondary cooling fan located almost in the middle of the two speakers on the motherboard. How do I know this? I have a Toshiba x205 dual SLi lap top computer, and my secondary cooling fan is located almost dead center of where my 4 speakers are located, occupying the same open area as the mount points for the speaker system. I had this same problem about a year ago, thought the sound was coming from the speakers, but it was coming from a slow starting but after a while a continues steady sound, very close to that clicking noise your are talking about.
Sound for the most part, when created, it likes to escape, the speakers are the closest thing to an escape point for that sound, because it rides the material that the speaker is made out of and escapes the computer, there for you hear the sound! When I was going through this, I told a friend and he recommended some me using some (3 in 1) oil, just dab it where the shaft of metal exits the motor area, the shaft that the plastic fan blades are attached to, drop one or two drops around the shaft, let it take it in for about 10-15 minutes before turning the computer on, and you will be right as rain!
Mind you, you have to open up your lap top to do this, so keep track of all those screws and just be mindful of what you touch! And by chance if the sound ever was to return, just remember where you placed that (3 in 1) oil!
