I run opensuse 10.2 and have a hp photosmart c3180 which ran perfectly straight from the box. When I upgraded to nvidia driver for an FX5200 card the system could no longer see the scanner although cups still sees the printer.
I wasn't sure so I formatted and loaded everything up again and the scanner worked until I loaded the Nvidia drivers.
I have hplip 1.7.1 and the hp-toolbox doesn't see the c3180 at all either printer or scanner but it still works as a printer under cups!
Any ideas at all as to what is going wrong and how to fix it.
Oh, and one more piece of info - from a Ubuntu live disk (which obviously does not load the proprietory nvidia drivers) the scanner is accessible again.