One of my internal drive's won't mount

I accidently removed an internal hard drive from one of the bays in my mac pro while the computer was sleeping (I thought it was shut down). Now, when I insert the drive back into the bay it will not mount. I've run First Aid from the disk utility several times and it's indicated as being ok but when I try to mount it I get a "mount failed" error message. Can anyone help?

One, possible two posts should read ground. Test for continuity against the metal case. Another should read 5V+DC. I think the four prong are: ground, ground, illumination then power. The connectors are gold plated and should not corrode, however, they are no match against fine particles of dust. You can carefully unplug both sides of the drive connections and vacuum. Usually, to unplug and re-plug is enough to get it to work again. When there no power coming off the logic board, you can find a Y-splitter and power off the other drive.

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