Quote: Originally Posted by boogieboy
That sounds very complicated to me.. Can i test it while the PC is on?
You need to!
and should i plug the Red pointed pin with yellow wire and Black pointed pin with the black wire?
Yes. By convention the yellow wires are 12v leads. The black wires are grounds. The multimeter, connected as described, will measure if you are getting a true 12v.
If you are uncomfortable with this then don't do it. While it would be hard to mess anything up (you'd have to cross - or bridge - the connections to short anything out and do damage. (Don't do that!).
Can you get your father to show you how to use the equipment? It really is a good skill to know if you are going to play with electronics.