You should have the Asus QConnector, the white block that takes the various connections and fits only one way into the motherboard. Inserted correctly you'll see the PLED+ in one corner and Speaker at the other on the top side.
Underneath you'll see a PWR with a Ground connector next to that which is where your power button connects and the case connectors should be labelled similarly, plug those 2 connectors in.
Do the same with the case connectors labelled Reset & Ground, same for the speaker, hopefully each one of these will be wired either into a 2 or 4 pin case connector.
There should be left the connectors for the IDE LEDs, one marked + the other -