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Inside the headphone socket there is a small lever that disconnects the feed to the speakers. When working normally, you would still get sounds in the headphones or sound from the speaker. Try spraying some switch contact cleaner into the socket to clean that switch.
When you plug in the headphones, the jack itself routes the signal away from the speakers. When you unplug the headphones, the jack has contacts that close again, routing signal to the speakers. If the jack contacts are dirty, they won't close correctly. I suspect were you to clean the contacts, you'd solve the problem.
Go to the icon tray and double click the speaker icon. Have a look in the Advanced controls to see if you have taken the mute off the pc speaker. There might also be an option to play sound on the pc speaker simultaneously with the headphones. If so, uncheck the dual play box so the sound will not play through the pc speaker when you have the headphones plugged in.
Connecting headphones to the system will disabled the internal speakers until the headphone jack is disconnected, at which such time the internal speakers should function again.
If you disconnect the headphones and the internal speakers are not re-activated, then there may be damaged to the microswitch in the jack. (Try rebooting after the headphones are disconnected too)
I would say it is because the unit does not have a built in amplifier. The speakers are powered PC speakers of studio monitors I am guessing. Try plugging the headphones into the headphone jack of the speakers if they have a headphone jack or try a set of powered headphones out of the Edirol and see if it helps.
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