Sound gone the sound is completely gone for no apparent reason, as if the Mute is on. If I turn the volume to maximum output, I can hear a distant sound in my speakers but that's it.

Volume only has to do with the sound level you hear.

The only thing that affects the sound the other ends hears is the microphone, Have you tried moving the mic? Has the headset ever worked properly?

If the other end hears you at all, then the headset SHOULD NOT be muted, but it's worth checking out. They put the mute switch on the underside of the boom mic and sometimes people hit the switch by mistake when moving the boom.

Plug the USB connector into an available USB port.
• Check your computer's volume level.
• Check if your computer's volume is muted.
• Check your operating system's audio input and output settings.
• Check the headset's volume and mute settings.
• Restart computer.

NEVER USE MAXIMUM VOLUME FOR TROUBLESHOOTING.

Turn the volume control to something medium.

The errant switch, control or condition may change and you will suddenly release the amp's full power and possibly destroying your speakers. If a signal isn't audible at 1/2 volume it's probably not there.

Carefully examine the front panel for clues like a misplaced Mute or Tape Monitor control or Multichannel Analog Input selected.

There is a good chance that a common control (volume pot??) may have developed a high-resistance or 'dead' spot through defect or idleness and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.

Turn the volume to something reasonable and see if that helped.

If you hear something faint this would not be a fuse issue.

NEVER USE MAXIMUM VOLUME FOR TROUBLESHOOTING.

Turn the volume control to something medium.

The errant switch, control or condition may change and you will suddenly release the
amp's full power and possibly destroying your speakers. If a signal isn't audible at 1/2
volume it's probably not there.

Carefully examine the front panel for clues like a misplaced Mute or Tape Monitor control
or Multichannel Analog Input selected.

There is a good chance that a common control may have developed a high-resistance or
'dead' spot through idleness and is causing your symptom. Turn the POWER OFF and operate
every control throughout its range a number of times, especially rarely-used ones like
Tape Monitors and the Mute control.

Turn the volume to something reasonable and see if that helped.

Yes.

NEVER USE MAXIMUM VOLUME FOR TROUBLESHOOTING.
Turn the volume control to something medium.
The errant switch, control or condition may change and you will suddenly release the amp's full power and possibly destroying your speakers. If a signal isn't audible at 1/2 volume it's probably not there.

Carefully examine the front panel for clues like a misplaced Mute or Tape Monitor control or Multichannel Analog Input selected.

There is a good chance that a common control may have developed a high-resistance or 'dead' spot through idleness and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.

Turn the volume to something reasonable and see if that helped.

NEVER USE MAXIMUM VOLUME FOR TROUBLESHOOTING. The errant switch or control that you eventually find and flip will suddenly release the amp's full power and you'll destroy your speakers. If a signal isn't audible at 1/2 volume, for all intents and purposes it's not there.

Look for a misplaced Mute or Tape Monitor control or Multichannel Analog Input selected.

There is a good chance that a common control may have developed a high-resistance or 'dead' spot through idleness and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.

Turn the volume to something reasonable and see if that helped.

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Hello, thank you for sharing your problem with us, I would personally be happy to provide the most accurate and up to date information for you.

Here is a copy of your operators manual
http://us.lge.com/filedown.do?filepath=1000004174&fileName=PG60_manual.pdf
Solutions
Press the VOL (+ or -) button to adjust the volume. If you want to switch the sound off, press the MUTE button. You can cancel the Mute function by pressing the MUTE or VOL (+ or -) button.
2. USE THE SOUND MODE OPTION BUTTON
Sound Mode: Selects the factory preset sound for type of program.
3.
SOUND MODES
 Multi Audio: Changes the audio language (Digital signal). SAP: Selects MTS sound (Analog signal).
4. PAGE 88 thru 95 go extensively into details regarding sound adjustment

It is likely that the amp is flat topped at the 7 setting. When the amp is producing the maximum voltage output it is capable of, that is ALL you can get out of it... The numbers on the dial mean NOTHING and are only relative. If you have high output guitars you might find the maximum might only be 3 on the dial for example...
If you need it louder, get a bigger amp and speakers. You should ALSO get a sound meter and follow OSHA guidelines for sound exposure... I know several musicians that now are nearly deaf because of being exposed to high sound levels... their music careers are now gone as they can no longer hear well enough. You need to protect your hearing for the long term. Great musicians don't need loud, but quality and inovation in their music.

Very well could be your amp setup. The only reason you would get lound sound from the stereo is if the mute is on or the audio outputs are fried. have you tried to hook up the stereo directly to a single speaker?

sound mute problem.
are you with electronic knowledge to fix this?
i can help.
nuwan.