I have 15", 1.8 GHz Macbook Pro with 2GHz RAM. The keyboard and mouse pad freezes from time to time. No button on the computer works except the power button. I always have to press and hold the power button to reboot the computer. The computer seems to be running normal. Just the keyboard and mouse pad don't work. I brought the computer to Mac guys @ apple for couple of times and the computer acts normal when he guys is testing. Anybody has a solution for this kind of problem?