Without the OS I can't comment about a common oversight. Which one?
The one when we install XP and must install MS UAA after the motherboard drivers but before the sound driver.
I also wonder if that other item called Dell Quickset was forgotten.
After many hours of trying to resolve the problem I've narrowed it down. The icon showing the speaker has a red X through it and at start up I get a message saying I need to reinstall my IDT High Definition Audio CODEC driver. So I said yes. After trying to reinstall the driver it comes up with a message saying a device attached to the system in not functioning so it cannot reinstall the driver. HELP please and thanks.