I seriously doubt that the problem lies with Firefox, especially since you can't hear videos. Do you see a little speaker icon in your system tray?
I have it circled in green here:
If you can't see it, click on the little arrow just to the left of the system tray as it may be hidden. I have it boxed in red here with a thin green arrow pointing to it.
Right click on the icon. You will see a little menu like this:
Click on "Open Volume Control" which I have boxed in green.
This will call up the Volume Control Panel which looks something like this:
Since you can't hear videos, and I suspect CD's, I think that at the very least, CD player is set to very low volume or muted. I have the CD column header boxed in pink as well as the mute button. If there is a green check in it, it is muted. Click on the little box to remove the check mark. Also look at the level of the switch which I have boxed in turquoise. If it is down at the bottom, this function is essentially mute. If this is the case, bring it up to at least the middle.
I have the main volume control header boxed in green. Check to see if the mute all box at the bottom has a check in it. I don't think it does, since you are able to hear winamp and games, but check anyway.
In order to see all the different volume control columns, click on options, then properties.
I have the options button boxed in orange and the properties button boxed in turquoise:
You will see a menu/window that looks something like this:
Make sure that 'Playback' at the top has a green dot in the white circle by it. I have it boxed in orange.
In the white screen you will see all the options for viewing in the main panel. The ones with green checks are the ones that are visible in the control panel picture above. For example: CD player which I have put a little pink line by. Now I'm going to put a check in the little green box by Aux (I have an orange line to the right of that option.) by clicking on that box. Then I will click on okay. The menu/window will now go away, and the control panel will be fully visible. This is what it looks like now:
I have the previously not shown Aux option boxed in pink. You will notice that the mute button has a green check in it, so any auxilliary devices won't produce sound.
Now you will have to experiment to see just which of all the options you have need to be un-muted so you can hear your stuff. Perhaps the best option is to un-mute all of them and see if you can hear your stuff. Then if you want to have some fun, mute an option and see what effect it has on any of your applications.
I hope this helps, and I also hope it is simply the volume control that is causing your difficulties.
Let us know if it works or not.
Edited by Orange Blossom, 13 August 2006 - 03:22 AM.