Oops I got nothing. But older machines do this many times so finding the source is fun. (for me that is)
I'll use a modified stethoscope and find that ticking is either some hard drive scan or an old coil that I can put a drop of SHELLAC on.
Do you remember how electrical coils are made and what the SHELLAC does?
I noticed 3,4 times by now, that when my comp is processing something it makes a ticking sound, like a clock: tick,,,,tick,,,,tick,,and also runs terribly slow,.
When I restart it is ok again. Does anyone know what this may be? I did the malware scan but didn't detect anything.