Both Mac OS and Recovery Hang on Apple Logo/progress bar

I recently tried reseating my graphics card because it seems to have died and now both regular Mac OS and recovery (installed to a separate SSD) hang at boot with the Apple logo and progress bar. Here is my computer build if it helps.

https://pcpartpicker.com/user/Ailuros27/saved/#view=Dw3vWZ

Edit: running Sierra or High Sierra. I can't remember which and can't boot to check.

submitted by /u/Ailuros27
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