| the file you need to edit is /etc/inittab find a line that says initdefault on it and change the number to 2. as for your resolution changing that might be something in redhat maybe a startup script is replacing the XF86Config file when you boot, i dont use redhat so i dont know. but the XF86Config file shouldnt be changing on its own if you arent running a configure program or editing the file manually.
edit:
you also might want to check if you have a login manager running like kdm gdm and the like, if so just uninstall them and your problems might go away
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cd /usr/ports/misc/life && make install |