My 3rd Party SSD won't mount

I am having trouble because I can't tell exactly what my problem is, in order to find the solution.
I have just installed a Crucial M500 SSD into a Macbook Pro. I installed and time machine'd it as an external drive, and it booted just fine (using the Option Key).
I put it inside the MBP, and I go automatically to Recovery. I can't mount the drive.
It's unclear to me if this is some kind of OS X problem, or if this is because of the 3rd party SSD issue that so many are plagued with, since Apple decided to lock down kext signing.
Regarding the Yosemite SSD problem, everyone on the internet points to this:
http://www.cindori.org/Trim-enabler-and-yosemite/
But this assumes the drive can be mounted. My Macintosh HD volume is grayed out and can't be mounted.
I have confirmed the drive is fine and the cable is fine, because the original HDD works fine if I put it back in the Mac, and the SSD works fine if I put it back in an enclosure.
I've already done the installation and time machine process twice, with the same results. Repeated attempts to repair and erase have resulted in worse results, until I took the SSD out, used it externally again, and put it back in.
I could really use some sage guidance here!

I gave you steps but not what to do at each step. So, you need to first boot from the external drive that holds your original system:
Boot Using OPTION key:
  1. Restart the computer.
  2. Immediately after the chime press and hold down the
      "OPTION" key.
  3. Release the key when the boot manager appears.
  4. Select the external disk icon.
  5. Click on the arrow button below the icon.
Next, you need to repartition and reformat the SSD which is now the internal drive:
Drive Partition and Format
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area.  If it does not say "Verified" then the drive is failing or has failed and will need replacing.  SMART info will not be reported  on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Apply button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
Now, you need to boot from the Recovery  HD that is located on your now external drive:
Boot Using OPTION key:
  1. Restart the computer.
  2. Immediately after the chime press and hold down the
      "OPTION" key.
  3. Release the key when the boot manager appears.
  4. Select the Recovery HD icon. If there are two DO NOT use the one labeled 10.10.
  5. Click on the arrow button below the icon.
When the Utilities Menu appears:
Clone using Restore Option of Disk Utility
  1. Open Disk Utility in the Utilities folder.
  2. Select the destination volume from the left side list.
  3. Click on the Restore tab in the DU main window.
  4. Select the destination volume from the left side list and drag
       it to the Destination entry field.
  5. Select the source volume from the left side list and drag it to
      the Source entry field.
  6. Double-check you got it right, then click on the Restore button.
Destination means the internal new SSD. Source means the external former internal drive.
Upon completion quit Disk Utility. From the Apple menu in the screen menubar select Set Startup Disk. Set it to the internal SSD. Select Restart.

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