I always forget which audio port is which on the back of my PC. Then because I’m inquisitve / too lazy and stupid to get a torch to look at the labelling next to the ports, or just randomly try them, I always google for an answer. This normally takes me about 5 minutes if I don’ get sidetracked (like now). The answer which I am looking for, that is suprisingly hard to find, is the PC 99 colour code http://en.wikipedia.org/wiki/PC_99
light blue = line in
lime green = line out
pink = mic