Hack boots to black screen after installing NVME drive

Hi - My perfectly working Hackintosh 10.15.3 install (Clover) went crazy after I tried to install a new nvme drive on my motherboard (first time I've ever tried one). Catalina is running on an SSD.

Obviously, I uninstalled the NVME M.2 drive, but now when my hack starts up, I get weird purple lines on the screen, which stops for a long time on the attached screenshot, and then boots only to a black screen. -x bootflag doesn't help. Can anyone help?

submitted by /u/alecwild
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