How do I mount a password protected partition?

2.5 GHz Intel Core i5 Mid-2012
Yosemite 10.10.1
Several weeks after installing Yosemite and suffering the frequent indignities of that wonderful update, now a partition disk on my laptop won't mount. It requests a password, and when I provide it and click ok nothing happens. The disk image doesn't mount on the desktop.
Interestingly, after typing in the password and clicking ok and not having it mount on the desktop, when I run disk utility it recognizes the partition and indicates it's already mounted. When I tell disk utility to unmount it I get the message "Unmount failed. The disk “Disk Image” could not be unmounted. Make sure that all applications and files are closed on this disk."
If I restart the computer and run disk utility, it indicates the disk is unmounted. I am appreciative of any support you can lend. I'm not a geek and I'm only vaguely aware of terminal, so have mercy in your responses, please

If it's a Numbers file, you will be prompted for the password when you attempt to open the document.
If it's an Excel file, you must arrange for it to be unlocked in Excel and resaved without locking before opening in Numbers.
Jerry

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As stated by reese, if you boot off of the install disk you will have options to do things that are not available when running the system.
Apple includes on the install disk a utility for your hard drive that does not come on Windows install disks (AFAIK). You can do repairs on the hard drive, erase and reformat it, partition it, etc..
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Please refer to the <b>SAP Security Guide for XI</b>
I have provided a url to link you to <b>Network and Communication Security</b>
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John Roehm wrote:
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