Audio gone
 

Turned off the computer last night, turned it on again this morning and everything on youtube is running, but no sound no nothing.
How can I correct that ?
L.

If you have done all the obvious checks (Speaker connection, Audio not in mute, rebooted etc) then it's could be a missing or corrupt driver for your sound card....Try to reload the drivers from the CD that came with your computer or go to the sound card manufacturers website and try to find the drivers.

Sometimes, believe it or not, all that's needed is a reboot as sometimes the drivers don't load in properly when Winblows boots up after being turned off.

Vista or XP? - there are some know issues with Vista and sound problems.

If your[vista] machine has more than one sound device (might not be apparent), the default sound device can get reset to something that doesn't actually play through the speakers.

Control Panel -> Sound, choose the default device if there's more than one.

Lafite

Here's one that has me stumped:

Second hand 2.0 Ghz Pentium laptop running XP Home. Re-loaded the sound card drivers. Sound from USB Skype headphones, but not from the 3.5mm jack or the on-board speakers.

I've checked and unchecked every box/button I can find.