Sorry guys, Hugo's agrsm trouble shooting is very constructive and easy to understand, but it didn't work. Same errors I had before appear when sound is disabled in BIOS. I tried "pci=noacpi" again, this time with this new driver "agrsm-20070804.tar.gz", but now it wouldn't even boot, it says "kernel panic" or something like that (wierd). So, I had to edit ("e") boot parameters, deleted "pci=noacpi", and Ubuntu started normally. Anyway, I know when to quit, don't want to bug you any more, obviously it won't work with my hardware configuration. Thanks everyone for trying so much! Ivan