Blew up my video; How to re-run/-configure to original?

I had a working system with an Nvidia card and the OSS drivers -- straight-outta-the box-13.1 install. I then tried to add an ATI card to the mix. When i installed the ATI drivers, they apparently replaced the Nvidia stuff, which was still my primary monitor, and i couldn't do anything after reboot. It was stuck on the default opensuse wallpaper with nothing showing up. I uninstalled the ati stuff, but the original KDE environment didn't return. I restored my xorg.conf file from backups, but that apparently wasn't the missing magic.

Is it possible to run a few zipper commands to re-config things the way they are after the initial install? Back when everything was glorious. Or am I stuck with re-installing the whole thing?

Thanks!