I'm currently really pissed at Apple. I love their computer, they are great, but there Customer service SUCKS hard! I bought some RAM form a third party reseller, and was more than happy to run 9.1. However because of my work I had to upgrade to OS 9.2, and then OS X, in order o beta test some new software. All worked fine for few days, and then no more RAM. My 256MB were not compatible any more. After doing some research I find out that by upgrading to 9.2, my firmware upgraded to a newer version. This new firmware disable third party RAM (Where was the warning!?!?!). I call technical support and they tell me reformat your hard drive, to all Zero and install 9.1 - All will be fine. So far I understand, they want people to use new RAM with OS X, fine! I reinstall OS 9.1 after reformatting my hard drive as they ask me to do, and still no RAM. I open the firmware, and see it's the new version. I call tech support back, and then they tell me you can't downgrade firmware. So because of Apple policy I lost the ability to use the third party RAM I bought and worked great before I run a Apple upgrade (virus), which didn't mention the fact it would disable third party ram, and would not allow downgradability. I then talk to customer service, and they told it was to bad for me, and I should of bought Apple RAM. I ask to talk to the manager but he never called me back! This is a scandal, and Apple should either send me some RAM, or replace my processor with the manufactory firmware in it!!