I have two peculiar problems with my new unibody 17" MacBook Pro... 1.) My optical drive vibrates and is loud with certain media to the point where I am using the machine at the same time my hands feel like I just used a lawn mower. And it is 2 for 4 burning discs of different types (DVDs / CDs). It comes back with burning errors. 2.) From time to time, my hard drive makes a high pitch sound for about 20-30 seconds and fades. The drive comes back as OK in tests and works OK...but it is concerning. Anyone else had these problems with theirs? P.S. I am noticing my screen flickering at low brightness too. This is something that just seems to have started.