wd 3tb External HDD shows up, but with 0 or a ? next to it

I'm running Windows 10. My MYBOOK used to run on both my computers, but will not on either anymore. In Device Manager, it is showing up but says it needs to be initialized, but won't. I run the Extended test from WD, but it, too, shows 0 for the size of the drive. I bought this as my backup, and now that I need my backup, my backup has failed. PLEASE HELP!!!
Reply to Tere__
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    It is possible that your USB bridge has failed, though it seems more likely that the issues is with the hard drive inside. It is the card that allows the SATA hard drive inside the computer to connect to your USB port. However, it also encrypts the data as it flows through the card, making it more difficult to access the data.

    If your data is important to you, I suggest you contact a professional data recovery lab before you attempt anything further. A few labs I recommend are:

    Recovery Force

    If you've ruled out using a professional data recovery lab, you may want to try one of the following procedures:

    - try different USB cable and/or power cable (make sure the power is the same)
    - try a different USB bridge from an identical drive (make sure the p/n o the USB bridge inside the case is the same)
    - although the data will be encrypted at this point, you can try to connect the hard drive directly to a computer with SATA or another generic USB bridge to see if the drive detects correctly

    My guess is this is an issue that is not a DIY case, but could very likely be a simple, sub $500 recovery by a reputable data recovery lab.
    Reply to DR_Luke
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