A few days ago, all of a sudden keys on my MBP started randomly not working. For example, you might type h and no h appears. No matter how hard I would hit "h" I didn't get anything. If I typed other keys I started noticing that other random letters would not work, but most letters would still work. After a few seconds of typing other random letters all of a sudden "h" would work again. The key that fails is not consistent, so this is not a "stuck key" situation. There is not change in the action of whatever key is acting up and hitting it repeatedly or harder does not do anything. When one letter fails, several others fail as well and I haven't figured out any pattern. One letter may stop working for a few seconds and 5 minutes later a totally different set of letters stop responding. Has anyone heard of this or have any clue what could be wrong? My first thought was that this was a software issue and not a hardware issue because I remember the MBP and MB's having a keyboard issue last fall, but now I'm wondering. FWIW, it started before 10.5.5 was released. I installed the 10.5.5 update and it hasn't changed the behavior. My MBP mostly sits at home and mostly sits in the office so it wasn't dropped or anything. Any ideas? I hate to have to take this thing back into the Apple store. I was just there a month and a half ago for a logic board replacement due to graphics issues. Just in case anyone else is having the problem, it's an early Penryn model bought the day they were announced.