Today I installed the newest updates for my kubuntu 14.04 and after I restarted the system, it won't load properly. It hangs on the logo. I was in a hurry, so I didn't look, what I installed exactly. Might be the new kernel.
The exact state is: the logo flickers as it usually does, till the point, where it should disappear and the login screen appear. But it doesn't. It just stops flickering. But if I press the shutdown button on my PC, the logo starts flickering again. I tried booting up with the previous kernel-versions (3.13.0-24 - 3.13.0-34) and the same thing happens (with the 24 the logo disappears and I only see a black screen).
I have an ATI graphics card with 3 monitors. Intel Core i5 ASRock z77 pro3
I am a noob, so I don't know, how to restore my system to a last working state. Please help me with that.
Thank you in advance!