It seems to me if you updated to nvidia 515.76 and now it doesn’t work then you need to stay with 515.65. There is a issue that some of us are having with the current driver (515.76). Downgrade like Jonathan said and then you will be able to boot.
So I managed to boot into Endeavour by using a workaround in the bug report linked above (FS#75995). Before booting into Endeavour, I unplugged my HDMI cable. After a few seconds, I plugged it back in and switched to TTY2 (TTY1 was stuck, which is the issue). I then restarted my display manager service and then, voila-- I was in.
Of course, I’ll now proceed to downgrade, since this is a ludicrous workaround.
So does this mean you have your monitor hooked to HDMI? I wonder if it’s hooked to a different port it works if you have it such as Displayport or Dvi?
I apologize I didn’t get back to you last night. But yes this is an HDMI issue or at least it seems that way. I haven’t tried displayport yet but I see people having success using it.
but note that I didn’t test it fully. So use it at your own risk.
It also asks if you want to add IgnorePkg to file /etc/pacman.conf, which means pacman will not upgrade it with other updates, but just warns about not updating it.
Or you can use the --ignore option in pacman, e.g.