Backup of Macintosh HD won't mount

I back up my entire system making an image with Disk Utility (as well as Time Machine). Time Machine doesn't back up Paralells VM files, so I went to grab it from my Disk Utility .dmg file that I made.  It mounts "Boot Camp" just fine, but refuses to mount "Macintosh HD", which is where the file is stored.
Any ideas?  It has to be possible to mount this!
MacBook Pro Retina (Mid 2012), OS X 10.9.4, WD 2 TB External

No, it's there. It's there on all my backup images. I used to be able to mount it. 10.9.4 won't let me mount it, for some reason. Even tried to mount from the recovery partition. No joy. It's just grayed out. Try to manually mount and it says could not mount. Use First-Aid and try again. First-Aid can't find anything wrong. Still won't mount.

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