No sound on Natty
I have an obscure Philips Freevents X56 laptop and have just upgraded to Natty from a clean install of Lucid and can't hear any sound.
Sound hasn't been a problem in the past and has worked out-of-the-box with Feisty/Gutsy/Karmic/Lucid. Has there been any fundamental changes to the sound system in Natty that I should be looking into?
The laptop is connected via phono leads to a big hifi amplifier and speakers and if I turn the sound up on the amp full-whack til the speakers are humming I can hear the sound VERY faintly so it's having a stab at it.
I'm not too good at diagnostics, so any help would be appreciated. I've tried the obvious volume sliders.