That's not a crash! That is the standard X Windows log-in prompt. That wouldn't happen on its own, so I assume you performed an upgrade at some point? When you upgraded, it is possible that the xdm (X Windows Desktop Manager) config file was updated and put back to its default. Anyway, press Ctrl-Alt-F1 to get to a VT (Virtual Terminal a.k.a. 'TTY console'), log-in as root user, and have a look at the contents of the file /etc/conf.d/xdm. If it contains DISPLAYMANAGER="xdm" then use the nano editor to change it to DISPLAYMANAGER="kdm".
For future reference, when you upgrade, it's worth checking if a new version of /etc/conf.d/xdm has overwritten the original, and, if necessary, you can edit DISPLAYMANAGER="xdm" to be DISPLAYMANAGER="kdm" again. So:
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# equo update
# equo upgrade
# equo conf update
# cat /etc/conf.d/xdm
# nano /etc/conf.d/xdm # Only if necessary.