Portable HDD Not Detected

I have a Toshiba External HDD and I've used it for about 1.5 years now.
I plug it into my PC (after about 3 months of using) it's no longer being detected.
It's not in Disk Management and not showing up in My Computer.

I've plugged it into my other computer, and it works fine.

I'm running Windows 10 Pro Version 1703

I need help :/
Reply to YT_SpiesBoy
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