No Sound

[ImLostAgain]

Everything was working fine yesterday but today when I try to watch a video on youtube there is no sound. There is if I plug the headphones in though.
It's the same on other sites like Vimeo FB or Dailymotion.
I'm on Windows 10 using Firefox although it's the same on Pale Moon and Edge.
I know I had this problem many years ago on Windows XP but I can't remember what I did to fix it
Anyone know what has gone wrong and what I can do to fix it?

[Zacs-Master]

Speaker symbol / setting in bottom right corner of screen - check you havent muted speakers or slid the volume to zero, or that you haven't set it to 'headphones' permanently

[ImLostAgain]

Cheers Zacs, slider was set ok but it was set to headphones.
I wonder how/why I did that!!

[Zacs-Master]

Excellent.

[Prudie]

When things like that happen to me it's nearly always the cat. She can do buttons etc on my laptop I didn't even know existed. Switching to airplane mode is her favourite though.

[ImLostAgain]

Ha ha, I used to have a cat like that Prudie.
No cat to blame now though, just me bumbling around messing things up ;)