Cannot boot with new SSD

Installed new OWC 240G SSD in 2007 iMac. Started up with old HD in external case running OS 10.10.2.  Initialized SSD with Disk Utilities, and it mounted on the desktop.  Transferred contents from old HD to new SSD. Computer boots fine from old HD in external case, but does not boot with internal SSD.  After displaying Apple symbol for a few seconds of the startup process, computer goes to a kernel panic and gets into a loop of retry message-Apple symbol-message-etc.  The SSD shows on the desktop, but does not show as a startup disk in System Preferences pane.  Disk Utilities shows drive is fine, but repair of permissions is grayed out.  Window says permissions repair is only permitted on OS installed with an Apple installer.  System folder on the SSD does not show the "blessed" symbol.  Have tried recloning using Time Machine backup - same result.  Installed eDrive on SSD with TechToolsPro, and can start up in eDrive thru TTP window, thus verifying all cabling.  After booting with original internal HD installed in external case, SSD will show on desktop, but will disappear in a few minutes after a message says it was improperly ejected.  Suggestions?  Is there a way to access OS 10 software purchased and downloaded from Apple site?

Many possibilities here. Maybe a bad connection when you installed the drive. Maybe a bad drive. Maybe a bad SATA cable.
How did you format the drive? Should be Mac OS Extended Journaled. When you boot into the recovery drive, access disk utility from there and see if you can access the drive.
I have the same drive as you. What I did is use Disk Utility from the recovery drive of TM. I first re-formatted the SSD drive. Then I used Disk Utility to restore the whole drive of my original to the new SSD drive.
You can still download the Yosemite installer from the App Store in your purchases providing you downloaded it from the App Store already.

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