The subject of voiding warranties came-up in a thread about hard drives, so I decided to post it under another thread. Recently, someone pointed out to me that in the U.S., the Magnuson-Moss Warranty Act specifically states that a company can't void a warranty for an upgrade. It was originally intended when companies were voiding warranties for using 3rd-party vacuum cleaner bags. They can certainly refuse to cover something if it has been damaged by the upgrade in the same way that they can refuse to cover damage if you threw the laptop out a window. But that requires them to actually prove that it was the cause of the damage. I used to work at CompUSA and the Packard Bell computers had a silver sticker. If you removed the case, the sticker split into two parts that each spelled out the word "VOID." But we upgraded Packard Bell computers all the time, as did our customers, and the warranties were still valid. It's just a scare tactic. Some places that do Mac upgrades even promise it will not void your warranty. So those of you who are afraid of upgrading Mac laptops need not worry.