Called the number Bruce posted and actually got to speak with someone (from India_na!) Basically, had me do the same things, uninstall, drivers, etc. as you all recommended. Nothing worked. Said it was possible built in sound went belly up, but not probable. Told him I had an old sound card and would try that. It worked, so the improbable happened. Imagine I could have gotten another MB as it was only 14 mo. old, but don't want to go through the hassle.
Thanks to all who provided assistance. Jeff