Many thanks for the reply. Problem sorted, it wasn't down to the software. Just my inabillity to read the instruction manual to the RF Wireless headphones I have attached to the output. They turn themselves off when no signal is received, and back on when one is - I just assumed it wasn't working correctly because as the system initialised periferals the headphones cut out.
Oh.. The problem was made worse by the fact that the system audio test didn't reactivate them, but I stuck a CD in - that sorted it for me.
I'm using KMix, KsCD etc with KDE 3.1.
:D