Headphones don't work on notebook.

I have mixed optical spdif/analog external jack on FS Amilo notebook. So windows 7 have installed high definition audio device driver and detected two playback devices Speakers (internal atapi jack) and Digital Output Device SPDIF (rear panel optical jack). So if i plug my headphones to external jack i don't hear anything, optical out is active.
How to enable analog output (and disable optical) through external jack?

have you tried going to control panel/sounds/playback then double click your device as listed which takes you to speaker properties and click the levels tab and enable disable outputs from there ??

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