So I’ve changed the display driver, not sure to which, I tried running Doom on PS1. The loading screen lasted forever, so I’ve restarted Retroarch. It never did; now it black screens on startup every time. Tried running debugger via the command line, but all it launches is… a black screen, so no help from here. Everything has been running OK until now. I’m on Win7.
Delete all your cfg files and try again.