View Full Version : Loud electrical hum from G4 ibook power adapter

26th January 2005, 02:04 PM
Help, I'm not sure if this is normal.

When the battery is fully charged and power supply is plugged in. My power adapter emits a loud hum when ibook it's turned off or sleeping.

Is this normal? Do I need a repacement?


26th January 2005, 04:59 PM
Do you have a surge protector where your power adaptor is plugged in? Or is it sitting on a multi-tab power board?

Try plugging it in directly to the wall socket and give it a try, my sub use to hum untill I let it sit on it's own. Could be dodgy power in my opinion.

26th January 2005, 07:57 PM
This is normal.

I've the previous iBook power adaptor - the 45W circular model - and it does the same thing. When the power adaptor is on but not plugged into the iBook, it emits the same hum - not that loud, but noticeable in a a silent room.

I've come across a few Apple power adaptors and they do emit this noise, some worse than others - I've another 45W adaptor on my Parent's Wallstreet Powerbook, which is quieter, but still does the same thing.