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Without having to plug ones in. Sorry if this doesn't makes any sense, but yeah..
If you are using Windows, go to your control panel from the start menu, and look under the "Sound" option. Make sure your speakers are listed and enabled.
If possible, update the speaker drivers as well.
A computer manual isn't going to tell you how to activate internal speakers. They come activated, his just got screwed up somehow.
a tip would read the manual.