Had a user with a new Dell T1700, super-fast machine, that couldn't get any audio out of the headphone jack. I assume the same would be true if speakers were connected.
I couldn't figure out why. The PC guy went to look at it and finally discovered:
"The nvidia driver was active as primary and was expecting a signal via the HDMI cable. I disabled it. We can thank the NVIDIA driver suite."
Who would have guessed?
David Haigh
Phone: 925-424-3931
Fax: 925-423-7496
Lawrence Livermore National Lab
7000 East Ave, L-362
Livermore, CA 94550
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