Altec Lansing P/N 00658T sound card OK, sound OK thru headphones, diagnostic OK, but no sound from subwoofer or speaker when playing music or other files. Addtionally, I first noticed this issue over a couple of years ago when I observed the letters HD in the luminated screen, on the right side.

Thanks,
Larry

Audio Players & Recorders - Altec Lansing - Multimedia Computer Speakers