What is that noise? iMac G3 400

[lewis82]

What the heck is that sound? It comes from the speakers of an iMac DV 400, and only when turned off. You can hear the sound changing a couple times: it was synchronized with my father starting his electric saw in the backyard.

Very strange. Any ideas what this could be? I highly doubt it is only residual electricity, as it lasted well over three minutes. I only kept the last part of the recording.

 

[Intell]

That doesn't sound to good. Does it happen when the iMac is not plugged in? And is the electrical outlet that the iMac is plugged into, is it properly grounded?

 

[lewis82]

It has always done this, since 10 years, so it can't be that bad. I was just wondering what it was.

I could try leaving the iMac unplugged, but since it does it only for a few minutes from time to time (I don't know if it does it every day, I just happened to be next to it while it was doing the noise), it would be hard to verify.

The outlet theory is good, I should have a look at that. Maybe it is also related to the Mac being plugged in a powerbar full of other things (modem, router, printer, external HD, external DVD, printer...).

 

[mrsir2009]

Shift the eMac to a completely different power outlet in your house and see if it continues.