iMac cricket noises..Comming from speakers not HDD

[Tannerstouch]

My iMac is driving me crazy, it's chirping like a cricket is stuck inside. Whenever it is chirping, I mute the system volume and it stops. This leads me to believe that it's not a hardware problem. I don't have any weird sound notification stuff going, and no new applications.

It's a 2008 24" iMac, 2.8ghz, 2gb of ram - the stock configuration.

Any ideas ?

 

[MinkyMomo]

Do you happen to have an iPhone resting nearby (e.g. a foot away or so), or perhaps another phone with either Bluetooth or WiFi turned on? I've found that when it happens, moving the phone away causes the chirping to subside.

 

[Roy]

I've had the exact same problem with my speakers for the last year and a half. And changing speakers doesn't fix the problem. And the problem comes and goes. I will get the cricket sound off and on for a few weeks, then the sound will quit for a few weeks and then it's back again. No IPhone or anything else I can link the sound to.

Jan 2001, 466 DA G4 tower with Apple monitor.