Getting a buzzing sound when power connector connected

Question

Hello,
Everytime I connect my power-connector to my powerbook, i get a buzzing sound, which sounds like something is being written to the hard drive. When I dont have the power-connector connected, the computer buzzing vanishes. Has anyone else experienced this? Does the battery really have to charge that loudly?
Thanks in advance.

Answer 1

What type of AC adapter do you have?
The Aluminum 15-inch and 17-inch MUST use a 65W adapter. Contrary to popular belief, the 45W adapters are not meant for these machines, even though they "work."
When I plugged a Titanium PowerBook's adapter to my aluminum 15-inch PowerBook, I got a buzzing sound emanating (coming out) from the AC's "brick." The TiBook's adapter was a 45W.
While connected to the standard 65W adapter, no problems with my aluminum 15-inch PowerBook.
45W is lower rated and doesn't have enough juice to charge your 15-inch or 17-inch correctly. While it is charging and providing power, it is weaker. You may notice it takes longer to charge your battery when connected to a 45W adapter as opposed to the 65W one.
Though, playing devil's advocate, some 65W adapters can make that buzzing sound if they are faulty or damaged.
SIDE NOTE: This makes it seem like the 65W adapter is then, logically, not good to use with the 12-inch PowerBook G4, but it is fine. The original adapter supplied with the 12-inch PowerBook G4s are rated 45W, but they replaced it later down the road with the 65W adapter. (If you get it replaced with AppleCare via mail-in service, you get a 45W replacement part. Though at times, 65W part. If you get it replaced with AppleCare via the retail's Genius Bar, they give you a 65W brick. Also, the compatibility chart for the 65W shows it to work with all aluminum PowerBook G4s).
Message was edited by: Pismo 900:
I'm not an electrical expert so someone may be able to corroborate my words above, but in better terms. For instance, the reason why the 65W works with the 12-inch PowerBook is that even though it supplies more power, the 12-inch can only receive 45W. On the 15-inch and 17-inch models, it needs 65W, so using a 45W "strains" the AC adapter because it is trying to draw more "power" (the 65W) it needs from a weaker plug. Thus the buzzing noise.
Like I said, someone else can explain that better, if it doesn't make sense. =)