I recently got a good RCA cable to connect my M-Audio Revolution to my hifi system's Digital input. Previously I had been using the Revolution's analogue output and it worked fine. Using the Digital output I have been unable to get any sound out of my hifi system.

The hifi is registering some kind of signal coming from the soundcard (no movement of level meters though), as it displays "PCM L & R" when the cable is plugged in, and the soundcard is processing the signal, as the output level meters are moving in the M-Audio control panel.

I feel that I must be doing something really obviously wrong, but I'm at a loss to know what . Any help would be greatly appreciated.

Edit: I am an Idiot. Changed settings to Digital (which I didn't see before) and rebooted, and it works.