Laptop black screen issues during restart, shutdown, and sleep

Hey there!
I've got a Dell Inspiron. It was running Windows 10, x64, and I decided to swap out the DVD drive for an SSD so I could boot directly from it.
Everything was hooked up, and I ran an OS migration using Partition Magic. The process went smoothly, and the laptop boots from the SSD just fine.
The catch is, I only realized there was a problem right as I was running the migration. Now, the laptop refuses to shut down, restart, or even enter sleep mode. It just hangs on a black screen and stays there. I have to force it off using the power button, but once I turn it back on, it boots up without any issues.
I did some digging online and tried a few fixes: uninstalling the Intel Management Engine driver, reinstalling my graphics drivers, disabling the network driver, and turning off Fast Startup.
I figured maybe something went wrong during the migration, so I formatted the drive and did a clean install of Windows, but that didn't help at all.
Every once in a while—maybe every fifth attempt—it actually shuts down normally.
Anyone have any ideas what might be causing this?

Managed to sort this out, just in case anyone else runs into it...
The BIOS was acting a bit funky.
If I set an old Seagate as the primary boot device, everything would load perfectly from the Samsung drive (tested it—there’s no OS on the Seagate).
But if I selected the Samsung directly, it would just claim there was no OS found.
Ended up pulling the Seagate, did a clean reinstall of macOS on the Samsung, and now everything is running smoothly.

It wasn't actually broken for very long. Turns out the culprit was just the caddy I used to swap out the DVD drive for a Seagate or a Samsung. There’s a tiny little switch on it—you just flick it into the right position and everything works fine again.

Swapping out your optical drive for an SSD is honestly a crime against technology, and there are three big reasons why you shouldn't even think about it:

1) You’re basically tossing your DVD player in the trash, which is a huge bummer if you actually own physical media.
2) Since that drive is likely hooked up to a legacy SATA 1 port, you're looking at speeds that are four times slower than SATA 3, meaning your expensive SSD will perform like some ancient, clunky hard drive from the early 2000s instead of actually being fast.
3) You're stuck with much lower storage capacity compared to what you could get otherwise.

That’s why I swapped things around—SSD in the laptop, HDD in an external enclosure.
I handled the storage bottleneck by using a 500 GB hard drive strictly for data backup.
As for the optical drive, it died over a year ago, and honestly, I haven't had any use for it since.
Saying it isn't the right move for everyone? Sure, I can get behind that. But calling it a catastrophically bad option...