I'm running one on my mid-2009 15" MacBook Pro with 4Gb RAM. It appears to be taking forever as it tests memory. It's been on Pass Number 2 for around 30 minutes now. The progress bar is either completely stalled or moving VERY slowly. Is this normal for the extended AHT? This is the first time I've run the extended test. I ran the quick test just prior to this one and it returned no errors.