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Now unplug the hard drive and external so that only the newly cloned SSD is plugged in. Will it start?
If not boot into WIn7 disk to run Startup Repair - Run 3 Separate Times
until it starts and is labeled System Active Boot.
You can then plug back in the hard drive, making sure the SSD remains set first drive to boot in BIOS setup. When ready you can wipe the HD with Diskpart Clean Command
to get it cleanest, or mark the old Win7 partition Inactive so you can delete it in Disk Mgmt and create a new data partition there: Partition - Mark as Inactive - Windows 7 Forums