Pop open a terminal and input alsamixerMake sure the channels aren't muted, especially Master. Marking MM at the bottom of a slider stands for channel muted, press m to toggle. Of course also check the volume is not zero, arrow keys change volume and channels.
There is a mixer for pulseaudio which is what you see in the normal graphical user interface. Below that is ALSA which also has a mixer and then comes the actual hardware as far as I know.
Glad to hear you like the X60 besides this issue.
