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My Dell D420 ... when i connect with headphone... it's working... i hear all of the sound (system sound etc) but i plug out the headphone i can't hear from my laptop speaker... i made just one time with headphone... in the previous, speaker is working well...

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clean out the headphone jacks – RobotHumans Jan 18 '11 at 4:39

Try reinstalling your audio drivers. If you can't download them, they may be located on your hard drive under C:\Dell or C:\Drivers etc.

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no driver software at under C: and others... :( – zmo Jan 18 '11 at 7:00

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