annoying fast soft ticking noise
(like 15Hz?) in lower left part of iMac 27" 2.93GHz i7 OSX 10.6.7 - started about a week ago, it's always there in the same frequency and volume no matter how hard the system works, it's gone when the system is asleep
It's not the HD, that makes another noise, also the ticking goes on even when there's no diskactivity
It's not any of the fans (checked with smcFanControl)
Does anybody know what it is?
iMac, Mac OS X (10.6.7), 27" i7