Ok, hopefully someone knows the answer to my question. I was upgrading the hard drive to my Rev B 12" PB a few days ago, and everything went smoothly, until when i was reassembling the case. After I had put the top panel and keyboard on, I heard a rattle in the case. Then a small black chip (pic attached) fell out of what I'm guessing was the memory door since that seemed to be the only opening large enough. The funny thing is, my PB seems to run normally: the hd is recognized and everything works. It kinda weirds me out that there don't seem to be any symptoms from missing this chip. But I'd like to know what it is, and if I should be wary of my PB catching on fire or what not. Thanks in advance!