This happened to me on my laptop also. After much looking at settings as you
did, I found that the phone plug into the laptop jack needed to be pushed in a
little firmer. It had locked into place but still wasn't making proper
contact witin. A little, tiny, "push", was all it took to restore function.

            Do you want to signoff PCBUILD or just change to
                    Digest mode - visit our web site:
                   http://freepctech.com/pcbuild.shtml