I received the 2GB RAM module I ordered from OWC today - upgrading to 3GB total in my aluminium iMac. This is both my first mac and my first RAM upgrade of any computer. I followed the directions for installing the 2GB module in the empty RAM slot, and when I booted up, I kept getting a "You need to restart your computer" message. This error happens a different times during the boot-up: before signing into my admin account, just as the dock appears, etc. Is there an obvious newbie RAM installing mistake I could be making? Should I be returning the RAM to OWC? What should I be doing?