I have a fresh install of Ubuntu 8.04 x64 on an Asus F3T laptop and I'm getting absolutely no sound from anywhere.

I did:
sudo modprobe snd-
And it found no sound drivers installed.

Here's the kicker... Ubuntu 8.04 x64 was already installed on this laptop as an upgrade from Ubuntu 7.10 x64 and sound was working in both 7.10 x64 and 8.04 x64 without any problems. I replaced the hard disk and installed Ubuntu 8.04 fresh instead of upgrading from 7.10 x64, and now I have no sound.