MacBook Pro will no longer recognize new SSD via USB

I just received a brand-new 512 GB Samsung 840 Pro SSD from Newegg this morning.
I own a 15-inch MacBook Pro (Mid-2012) with 16 GB of RAM and a 2.3 GHz Core i7 running Mavericks (10.9.1).
Earlier today, I plugged in the SSD via a third-party USB-to-SATA adapter that I also purchased from Newegg at about the same time. The machine recognized the new drive, and I opened up Disk Utility to format the drive as Mac OS Extended (Journaled).
Once that finished, I used Carbon Copy Cloner to clone my existing HDD to the SSD. Before it began, the program asked me to create the Recovery HD, so I enabled that option. The rest of the process proceeded smoothly. I quit CCC, ejected the drive, and put it away for the rest of the workday.
When I arrived home tonight, I plugged the SSD back into the Mac in hopes of test-booting it externally. Unfortunately, the machine will no longer recognize that anything is plugged into the Mac. I find it highly unlikely that the USB adapter could be malfunctioning; I unboxed it this morning and it's been mere hours since the successful clone attempt. I also find it hard to believe that the SSD could be broken, either.
I tried to disable rEFIt and manually invoke the boot selection screen, but even when that happens, the drive fails to mount. For the same reason, I can't erase the drive to start over, either. I've tried both USB ports, as well as rebooting with the SSD connected and unconnected.
My research tells me that people often have problems trying to get SSDs to boot when they've been installed in the drive bay, but nothing I've seen suggests anyone's had a problem booting from the external SSD after a successful clone attempt. What am I missing?

I'd start by resetting the SMC. Follow the method for "a battery you should not remove yourself."
http://support.apple.com/kb/ht3964
I have no experience with Samsung SSD's, but I've read a number of posts here of people having problems with some of them. That could be a possibility.
The other thing you could try at this point is to swap the drives. If it's cloned already and the drive is good, it should boot. That would indicate the enclosure failed after the copy.

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