Clicking Sound When Standby Power Active

I vaguely recall seeing a previous message on this, but have forgotten what the fix was (if any).I have a periodic clicking sound (perhaps at the end of the Standby Power audio wav(?) file). It's like a small static discharge every 3 or 4 seconds. It disappears when I switch off Standby Power.I recall a similar annoying sound in PS1 for which someone provided a modified wav file (the ends of the file were somehow cleaned up to prevent the clicking).Any suggestions? (I may be able to modify the file myself.... if it is a wav file). All I need to do is find it.Thanks.Cheers.Ian.