A few days ago I got a W.D. 2.5 inch SSD. After having a lot of problems replacing my hard drive with it, I cloned my hard drive onto the SSD, then installed Windows 10 via a USB onto a separate, empty partition. I booted my PC on my old hard drive, and merged the SSD partitions. Then I disconnected all other storage devices from my PC except for the SSD. It now boots, but it's stuck on a black screen with a basic loading circle spiraling for a while until the computer automatically shuts off or goes into sleep mode or something. How can I fix this?