On 05/16/2016 10:51 AM, Oliver Zemann wrote: > Using nomodeset worked. Diagnostic kernel did not work. Any idea what > i have to do to boot without using nomodeset? Does the system not boot, or do you simply not get a VGA console? If it's the latter, you should be able to log in and check the system via SSH. I'd guess that the system is selecting a mode that the monitor attached doesn't support. If that's the case, then your options are to use "nomodeset" or to specify a generic VGA mode that you prefer.