I have 15 inch MPB 2.4 A1226 that has developed the "random shutdown syndrome." Doesn't matter if it's plugged or running on battery; simply shuts down without warning. Tried replacing battery, power supply and reinstalling Snow Leopard with no success. Reset SMC and PRAM etc, no dice. I'm considering replacing the logic board. I have a line on a reasonably priced board for an A1260 2.5 GHZ (T9300), which would be an upgrade to the one I have. I assume this board will work in my MBP, but figured I'd check in with the experts first before attempting the replacement.