Update to my weird hard drive issue

I changed out my PSU recently, and after doing so, one of my internal hard drives would no longer be detected or power on. Every combo of wires and connected drives didn’t work, with every other drive working perfectly fine every time.

I brought my drive to someone who had an external hard drive dock. Plugged it in, and presto! It powers on with all my data intact.

I bought a new hard drive and put all my data from the buggy drive on it.

I’m glad I didn’t lose any data, but I’m still mystified as to why I can’t plug in the drive internally.