weird Powerbook 'vibration' when using power adapter

If you have the power adapter plugged in using the 2-prong flip-out plug, try replacing it with the extension cable it came with. It's a 3-prong, grounded plug. That might take care of it. Sounds like it's a slight ground loop you are feeling on the metal skin.

 

there's a former thread about it. it is not dangerous, and can be alleviated by grounding your laptop.
http://forums.macrumors.com/showthread.php?t=296880

 

Interesting

That used to happen to me with my 1.25ghz PB a while back. Always thought it was nothing myself.

 

Vibration On Macbook

Hi,

I bought a new MACBOOK recently, the all aluminum version and found that whenever i plugged in the power adapter it would give a vibration onto the display as also the metal frame near the keyboard and trackpad. I almost thought that i have buggered up my adapter whilst using it in the train on an 110 V socket as the standard supply in India is 220 V AC. I figured that the actual problem was with the grounding as there is none with the two pronged connector of the adapter provided with MACBOOK. So I shifted over to the three pin connector with the third pin grounded on the power source end i.e. the socket. Since i was using a Euro socket on an Indian 3 pin configuration it did not work so i pulled out a sheathed cable from the euro male connector and routed it into the indian third pin socket. The problem is now resolved and i do not get any vibration / shock on the aluminum body anymore.

 

I've had this same problem with my Macbook Pro and it is the most ridiculous problem to still exist. I have a toaster, TV, blue ray player, etc. with exposed metal and none of them have this problem while using a two prong plug. Why should my $2000 apple? It's crazy! And then they'll tell you that YOU are using the WRONG plug. What am I supposed to say - "Gee sorry I bought it from you and used it on your machine, Apple"?

And to all those who are saying it's no problem, I hope you enjoy your daily shock treatments.