The problem for me would be that i have absolutely no idea on how one could build that laptop. I wouldn't know how to build a transistor, i have almost 0 knowledge of electronics, people at that time probably knew more than i do. So, except letting them tearing the computer apart to examine it, there's not much i could do.

That's something i've always been bothered with : suppose that you'd be teleported,naked, to ancient greece, how could you prove to them that you come from the future ( provided language isn't an issue). In my case, the only thing i could came up with were maybe some basic notion of how the human body works, biologically. But that's very thin. I know a bit about general relativity, quantum mechanic, physics, logic, etc. But i'm in now way sufficiently advanced in any of those subjects to prove or demonstrate anything to anyone.