I have done nothing other than unplug the wires, move the PC (Dell Precision 340, 2.53GHz) to another location, and reassemble. Cannot now get ANY sound out of it (internal speaker OR external speakers) in spite of having checked the hardware functions and found that everything is "working normally".
I've also run the helpful Creative Diagnostics utility, which has also "confirmed" that everything is working normally. Sound card is SB Live! and has always worked flawlessly in the past.
What on earth can be going wrong? I've spent hours on this with no success.
Any help massively appreciated.