Tried alsaconf & got:
No supported PnP or PCI card found. Would you like to probe legacy ISA sound cards/chips?
Tried the probe but cancelled it when I did not recognise anything it put up.
I have onboard sound. Asus P7P55D-E Deluxe.
You may want to do some reading at:http://www.via.com.tw/en/support/tech_faq.jsp
And the specs for your motherboard are at:http://www.asus.com/Motherboards/Intel_Socket_1156/P7P55DE_Deluxe/#specifications
Your motherboard has a VIA VT2020 sound system with a ton of features. It may be you need a specific driver to support its feature set correctly? It may be that a request to the packaging team will get the drivers for this put in the Synaptic repositories for you (and others who use this hardware) if it's not there already, but, failing in that, you may have to install them yourself. (That's not really a recommended course and may cause problems for your system... be prepared to experiment.)
This is something that happens now and then - a hardware manufacturer will build something with a chip so new that Linux hasn't caught up to it yet. Give it time, and, meanwhile, keep pluggin' away at it. You'll get where you need to be with patience and persistence.
One last question: is this related to your other thread about no sound in headphones (http://www.pclinuxos.com/forum/index.php/topic,101515.0.html
)? Just happened to think about that... this may very well play into that problem, too. Definitely check to see if you are set up for 5.1 channel output (in which one jack feeds the front speakers, another feeds the rear, and a third feeds the subwoofer). If so, and you are using more conventional speakers, you may need to reconfigure the sound system to your hardware.