I presume you are talking about Built-in speakers. If you are not, please post back.
When you use gmail to launch Firefox to go to YouTube to play Videos, it is hard to decide whose soundsettings you may be dealing with.
System preferences > Sound...
... has the main sound level setting. Volume is also controlled by pressing sound-up or sound-down or Mute buttons on the keyboard.
The player you are using, such as Firefox, may have an additional setting in its Player window. If you wiggle the mouse along the bottom of the window, you may see an additional Volume control there.
thanks for replying.
Yes referring to built in speakers.
Its not firefox as exactly the same thing happens using Safari.
yes, all speaker volumes everywhere I can think of are turned to max, I also reheck with the keyboard key,the icon at the top right of the menu bar, and also on the video that is playing.
Since I've spent 2 hours on this! ... I might just leave it, it is frustrating but not worth any more of my time.
I just wondered if there was something so obvious that I was overlooking.