I have that same power supply, and i hear this ticking noise also. But even with my ear to the case while it's switched on i cannot hear the noise (my PC isn't the quietest but not loud), I only ever hear it while the PC is off and the room is quiet. Doesn't really bother me so i haven't posted about it before, but i would be interested to know what was causing this to happen.
I think it doesn't happen all the time, but I'm not sure on that one. What is the noise of the ticks comparabe to, and are they sequentail? The ticks I hear appear to be sort of random 1-2 per second.
[EDIT] Just read the rest of the thread (didn't realise there were two pages). I bought mine from OcUK about 5 weeks ago. I have had WAY to many problems RMAing items to OcUK and the noise doesn't bother me so mine is staying exactly where it is. [/EDIT]