I did exactly what OWC told me to do and I even bought their RAM too...things started off shaky a couple weeks ago when it would freeze and restart...but for the last 2 months things have been fine. Now I'm doing a lot of work on iMovie and it has already frozen twice and restarted. It's showing 5GB of free RAM?! I originally had 4GB of RAM and I got another 4GB of RAM and put them in the two open slots that weren't used. Any ideas on what I can/should do?