I am quite frustrated. I am returning my 4th 15 inch MacBook Pro 2.53 with a crashed hard drive since October 2008. Each one lasted about 6 weeks. The first time the computer freezes and I have to shut down by holding power button seems to be the end of the computer. They do not start up again and each time I return to the apple store and they tell me its the hard drive. Tomorrow I am returning the 4th one. Anybody have any information?