Open a terminal: (applications > accessories > terminal) and run
alsamixer. You can choose between the different volume levels with the <-- --> arrow keys. Move all the volume levels all the way up with the up arrow key. (The down arrow key lowers the volume). If anything is muted, you can unmute it by using the
M key. Then hit the
Esc key twice to exit. Then test the sound. If the volume is better, run:
in the terminal to keep it that way when you reboot.
And welcome to the LQ forums!