Trayloading mac makes noise when connected to AC

Bluesman

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I have an old tray-loading mac G3 (the first one) that i use for college work. I use it every day for at least 4 hours, so it's really a work horse.

It works like a charm and i love it, but when i got back from vacation today, I noticed something strange. I always un-plug all electronic stuff when i leave my house for longer then a week. When i plugged my Mac back in into the wall power, i started to hear a high-pitched noise. I heard it before and always thought it was the CRT tube making noises while cooling down but this thing has been off for 3 weeks. The noise persists untill i unplug it again.

What could this be? It bothers me because it shouldn't make noises when it's turned off.
 
Test it in another room's power outlet to see whether it's actually the computer's problem...
 
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