Thank you PerfectSound! This worked -- sort of -- after more than 2 years of complete frustration, I'm now listening to iTunes playing through the onboard speakers.
I'd given up so many times, for months at a go. Been trolling these "red light" forums for all that time -- tried every trick mentioned -- nothing worked.
So thank you...I can cut back on the Xanax now (kidding).
Now for problem No. 2 -- how do I get sound to come out of headphones or external speakers plugged into the "red light" port?
Has anyone out there tried a USB sound adapter?