C50-AST2NX2 will not read internal hard drive in external box

Purchased HGST (Hitachi) Deskstar 3.5 in. 3 TB internal drive and put it in a StarTech external drive box (that claims to work for up to 4 TB drives).  When I fired it up, computer loaded up the driver just fine, but Windows Explorer does not show the drive.  Swapped the internal drive into another StarTech box (which had a Hitachi 500 GB internal drive in it, and worked fine), same problem; swapped USB cables, same problem.  Plugged the StarTech box into my old Toshiba L455 Satellite computer, didn't work there either (the 500 GB internal drive worked fine there, also). Thinking the new drive was bad, ordered another; just hooked it up, and - Same Problem!  Saw another thread about another drive not being recognized, and that the problem was that the drive was a USB 3.0.  Tried in this computer's USB 3.0; still doesn't work.  I couldn't determine if the new 3TB was a 3.0 or 2.0 USB.  So what do I do now?  The other thread mentioned a Y-cable, so could get power from 2 USB ports; which ones-the two 2.0 ports?  This is frustrating, and sure could use some help and/or advice. Thanks.
9/28/13 Update:
Wow, 49 people have looked at this, and NO ONE could think of a solution?  I'm disappointed.
I had a techie come over, and she figured that it was the chipset on my Toshiba (supposedly a brand-new computer-must have been an older model, though the actual box was new) that was the problem; it was so old, it wouldn't allow any drive higher than 2TB.  We tried downloading updates to the chipset; no good.  What I'll end up doing is buying a NAS enclosure (bought it yesterday, as a matter of fact, from Newegg, a Synology DS212J enclosure, based on the compatibility of my existing 3TB drive (Synology has a list of compatible drives for it enclosures on its site)), and add the 3TB drive as a network drive.  I then purchased a 2TB Hitachi drive off Amazon (again getting a compatible drive from the Synology site) to fill the existing StarTech enclosure.  The DS212J is a two-bay enclosure, so I can add another 3 TB drive later on.  That should take care  of my storage needs for some time to come.  Later.

Answer has been found.  The internal drive SATA cable was replaced and the system is now working correctly.

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    Any ideas? or is it time for the ol' Apple repair shop? Could it be just the drive or something more serious? Luckily I have a time machine and everything should be backed up incase of the worst scenario.
    Any help would be great. thanks.

    It sounds like the drive has failed, you can try starting it with the install disc it came with and trying to repair the disk. The instructions for doing that are:
    1. Insert the Mac OS X Install or Restore disc.
    2. Restart the computer, then hold the C key during startup.
    3. From the Apple menu, choose Disk Utility. Do this in the first screen of the Installer. Don't click 4. Continue. If you click Continue in a Mac OS X Installer version earlier than 10.2, you must restart from CD again.
    5. Click the First Aid tab.
    6. Click Repair Disk.
    7. After repairing the disk, try to start from the Mac OS X hard disk.
    If the drive still cannot be seen then make an appointment with an AASP.
    Regards,
    Roger

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