Cannot boot laptop due to video driver

[poma]

On 16.01.2015 07:20, Robin Laing wrote:
> Hello,
> 
> I am trying to help my child whom is across the country repair their 
> laptop after installing the wrong video driver.  They can boot into 
> emergency mode but not any of the other kernels.
> 
> During booting into the system, the boot process stops close to the 
> point of starting KDM.


It is *boot*-ing OK, only the *init*-ialization of the userspace service - in your case display/login manager(KDM), doesn't work.
KDM depends on the X server, which in turn depends on functional X video module *and* kernel video module.
You should deal with modules within 'multi-user.target'. i.e. non-graphical user environment and shouldn't touch the configuration of the boot loader, at all.