1/3 displays not working after reconnecting drives.

Hi all,

I finally decided to bite the bullet and install High Sierra onto an SSD I added to my rig. To do so, I disconnected all of my drives (one of which had a working Sierra install with Clover) and installed to the SSD. I managed to get everything to work and the OS natively supported my RX480 without any modifications.

Once I verified that everything was working well, I reconnected my drives to get the software I needed. After a reboot however, one of my displays just wasn't working anymore even though it loaded the BIOS and Clover just fine as it always did. I figured there might be some conflict with the Clover install on my original HDD so I disconnected it, but still no luck.

I'm doubting that it's a wobbly connection or anything because, as I mentioned earlier, it loads the BIOS and Clover screens just fine. Any ideas as to what may have caused this?