Quicktime plays video but no audio

Trying to play Quicktime videos from Prentice Hall website associated with textbook. Browser has up-to-date Quicktime plug-in and when tested there is video and audio. But when video is played from selected website, there is video but no audio. Tested using Google Chrome, Internet Explorer and Mozilla Firefox but results are the same.

Jacumba,
Here is the link that the professor provided -
http://wps.prenhall.com/chet_martin_audiology_11/194/49692/12721280.cw/index.htm l
The instructor tried on the computer in the classroom that she uses and I also tried it on the computer in my office. ON that website are different QuickTIme videos embedded in the different chapters. Clicking on the QuickTime link (box), the QuickTime logo appears, then the image appears but when Play is pressed, the video plays but there's no evidence of audio. The volume control on the QuickTime movie is at maximum and I have the volume on my computer at maximum, but there's no sound whatsoever. LIke I said, I have the latest QuickTime plug-in and when I test the plug-in, I get video and audio.
I'm trying to find out an answer for the professor because she uses the website in her course.
Any suggestions would be most welsom.

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