This actually happened years ago. Actually, it was probably nearly ten years ago, but it's one of those things that I occasionally remember and then promptly forget to enquire about, however this time I actually put my mind to asking the question when I was reminded of it, better late than never I guess. Essentially, I have an iMac DV 400 (the 2001 Indigo model that was also available in Ruby with a Slot Loading CD-ROM). One day many moons ago, I moved it for some reason or another, and this yellow chip fell out of it. I had no idea what it was, what it did, where it came from, nor did I really care as the iMac still worked fine (and it still does to this day, to a point). Today, I had the RAM access bay open as I was inspecting the module and I noticed this (note the vague red circled area): The thing that fell out of the iMac looked just like those and since there's a missing one in between I'm fairly sure that's where it came from. So what is it? Does anyone know? Like I say the iMac works fine and dandy to a point - the CD-ROM drive is kaput though (runs, just won't read discs and eventually spits them out) and the monitor is getting a bit long in the tooth, but other than that I've never encountered any issues with it so whatever the chip is, it can't be that important.