No Sound On Line?

[pantherman]

Windows 7
Firefox browser. (Also tried with Opera and IE)
COMODO firewall.
AVAST anti spyware
Winpatrol
Spyware blaster.

Don't blame anyone not speaking to me, but now my computer speakers have ceased working! They worked yesterday and I have not changed anything.

Tried a set of speakers that work on another PC. They play Windows start and close down noise. Also work when playing CD. But nothing on You Tube or elsewhere on line.
I have checked volume control set high.

Done Fujitsu system check.

Checked for nasties by running scans with Avast, Malwarebytes, Superantispyware. All clear.
Problem is only on line. Use any program on computer and it make appropriate noise!

Any helpful suggestions please?

[pantherman]

Update:

Can play tunes from :
http://www.firstworldwar.com/audio/1915.htm

But still not on You Tube. I must be missing something?

[PCdoc]

You might have tried but an obvious check - While playing youtube, there is a volume control slider below the video itself. Try moving it to higher side and check.

[pantherman]

You might have tried but an obvious check - While playing youtube, there is a volume control slider below the video itself. Try moving it to higher side and check.

Thanks, but tried that.

[PCdoc]

Re-installed Audio drivers?

[pantherman]

You was right. Did not realise I had to hover over clip to get the slider up. Thanks Now solved.

[PCdoc]

wow! Glad I could help