I'm not sure, markvdheuvel
, but, as you have an ATI Mobility Radeon card, try what I suggested in my post of 28 Oct. 2013 or what anomaly65
suggested in his post of 31 Oct. 2013 in the following thread: Help. Blinking cursor on reboot after updates
. It may be that by forcing the use of the open-source Radeon driver instead of the closed-source FGLRX driver, or by disabling kernel mode setting in the case of the closed-source FGLRX driver, you can get to a Desktop. Worth a shot, anyway.