that sucks, how long did you have it for before logic board went out?
It stared with random shut offs couple of days ago... so 6-7 weeks.
I think its a malfunctioning temp sensor.
I love calling Applecare... I talk the talk, within 30 seconds I had a case number and got transfered to a specialist. Another quick convo, and dropped it off at a depot within the hour.
Sounds like alot of people are having this problem...