Have you check Device Manager and under sound, video and game controllers to see if you have any yellow ? marks next to anything. You would go to start-control panel-system-hardware-device manager.
If you have any yellow marks missing then you will need to find the driver for those.
It may be a codec that you need too.
Also Start/ control panel/ Sounds check that MUTE is not selected and that volume is UP.
Could be these drivers that you need Audio Output:
Sound card Audio
Codec: STAC9751 Compliant Standards: AC '97.
Check this site and make sure you have the complete model number, There are several different ones for your Cf51 that should look like this CF-51xxxxA/H/Qxx (mk1) . Some model numbers require that you have Sevice Pack 2 or SP2 for windows installed for the sound driver to work.
http://pc-dl.panasonic.co.jp/cgi-bin/itn/toughbook/dl01.cgi
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