Help! No Audio on .MOV files using Yosemite

I just purchased the new Retina display iMac with Yosemite installed and I noticed that the audio will not play on any of my .MOV video files. The audio seems to work with my other video files such as .MP4 and .3G2. Can anyone help me resolve this issue?
There are two potential problem areas with many sub-possibilities here and you will have to some work on your own to determine which issue is at fault.
1) The MOV file container is generic and may contain audio and/or video data compressed in a format no longer supported by the media player you are using or the media player may not be programmed to expect an otherwise compatible data format to now be used in the MOV file container. In this case, you need to determine what codecs were used to create the data format that is not playing or is not supported. This can normally be done by opening the file in a player and checking the Inspector, Info, Properties, or similar window or use a dedicated media utility to determine this information. Once you know the format you can report back here with the information. You will also need to confirm in which media player you are attempting to play the MOV file. It will then be possible to tell you if the file should be compatible with this player and/or how to fix the issue.
2) The file may have a "security" issue. That is, Yosemite may include a security update that takes exception to something about the file—i.e., its container, headers, or the method by which the file was transferred to your system or some application used along the way. This problem is more difficult to solve. In some cases, you might be able to simply change the extension or copy the data to a new file container one way or another. In other cases, you might have to wait for Apple to fix the problem with a follow-up update or use an alternative player that ignores the supposed "security" issue.

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Help! No Audio on .MOV files using Yosemite

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