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The problem is in the earphone jack, when you plug headphones into the jack it dis-connects the internal speaker. Since you can hear the sound through the head gear, it indicates the jack is defective and needs to be replaced, or it needs a good flushing of electronic contact cleaner, attach the supplied straw and aim it in the jack and spray, next take the headphone jack and push it in and out quickly, repeat the process three or four times, If this fails the laptop will need to be dis-assembled for continued repair.
You need to check that all of your sound devices are enabled. Most laptops will shut down certain devices when on battery to conserve power.
There are setting available to alter the microphone gain in the sound settings part of the control panel. Under Sounds and Audio Devices Properties. Check the sound recording section under audio, make sure the microphone is enabled and that the volume slider is not at minimum. Under XP there is a test hardware button that should help.