Just got this macbook about a month ago. 1. When I open it up, sometimes the keyboard won't work. That is, no letters, numbers, or any other keys work. I have to wait usually about 2 minutes and they start working again. Is this normal? Sometimes it's not just when I open the laptop up, it will happen randomly. 2. I upgraded the RAM last week and when I took the old RAM out, there was some white corrosion on the metal contact points. Whats this about? I've never spilled anything on the machine and it hasn't seen a moist environment (except for when it rained and it was in my backpack in a separate pouch). Help!? Does my machine have problems or is this normal? Thanks in advance.