hello i have a problem with Linux 2016.2

Use kali for years and have never had a similar problem

on my system have kali 2.0 with repo SANA (deb http://http.kali.org/kali kali main non-free contrib)

i have changed the repo /etc/apt/sources.list with the string
deb http://http.kali.org/kali kali-rolling main non-free contrib

planning to hold kali updated given the command "apt-get update" and "apt-get dist-upgrade"

After about an hour the system has finished updating,
After rebooting the system will not start. I tried in all ways also with runlevel 2-3-4 ... but nothing ...
I tried to download the kali 2016.2 cd and install natively ... but nothing ... the system will not start to reboot

Use kali natively and not in vm

installing version 2.0 works correctly.
there are repositories that I can use with kali 2.0 and keep the system up to date?
I'm forced to go to Kali 2016?
there are a bug?

my sistem
intel i5
hdd ssd Kingston
nvidia gtx 950

thank you