I know what you mean about the cables not being labeld, I have an Akasa Fancontrol unit (the 21in1 thing), and it doesn't have them marked as to what is what, but I just kinda guessed and they fitted in the right ones.
Also with the Lian-Li ones I'd have thought that you could trace them back from the front as the others have said, I think I can for my PC7, but then I removed my front bracket for USB etc. as I didn't want it, so I can't remember/check as the bracket and cables are about 150miles away.
If you mean the on button etc. Lian-Li should have marked them (suprised if they didn't really, good make and all), and if not then I think most people on here can help with what goes where.
No worries on the reply, I wasn't sure what you were refering to and we all have day days.
InvG