the intel 810i chipset support under linux is very stable. i doubt that your problems with the sound installation are related to the 810i. more likely, it's a problem with your module installations. what kind of soundcard do you have?
you need to check your modules.conf file to insure that the correct driver is being used and installed.
what model of motherboard did you replace the old one with (and what model was the old one)?
and, last question, what errors does X give when you try to start it? you mentioned the agppart errors, is there anything else?
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