I'd check the speakers on another PC/laptop and the plug-in socket on the tower with a headphone. Just to be sure that it's something in the PC, not in the speakers.
Device manager only checks the drivers, not the device itself.
Using W7,Ultimate. Creative speakers
I have lost the sound.
On checking - by clicking on the speaker icon at the bottom right - I am informed that the device is not plugged in.
The plug-in socket is at the back of the tower.and has been working for many years, and the plug is firmly inserted.
The speakers are live and their 'on' light is on.
I have removed the plug and re-inserted it but the troubleshooter still informs me that they are not plugged in.
I have switched off the computer and back on again - they still do not work.
The Device manager informs me that "This device is working `properly"
Not quite sure where to go from here, any advice would be gratefully received!