This is from a long time ago — so I'm probably unable to provide clear details — but I accidentally did something really dumb with a family member's external hard drive.
If I am remembering the details as correctly as I can, but I think it was a Western Digital drive, one of those My Passport models probably, I don't know which one for sure. I think what happened was is I was cleaning up and absentmindedly plugged in a cable into it and into a computer thinking it was fine because it fit.
I believe what I foolishly did was plug in a USB 2.0 to Micro-B External HDD cable into it but the cable it took was a USB 3.0 to Micro-B External HDD cable. I just remember that ports were similar but just that cable I plugged into it was so like half the size of the actual port on the drive.
So ever since I did that, the drive doesn't seem to power on/be recognized by the computer anymore. Is this drive beyond saving? I was never able to find anything that could help me determine if I had accidentally completely toasted the drive or if the only thing I broke was like the plug interface, so that it just wasn't receiving power and perhaps the data on the drive itself was still accessible in some way.