Installation problem won't complete

I tried to install zorin os from the DVD, and i got a prablem, it's when i click in the option " Try or install zorin os " after that it will do " checking md5sums " then it will show up the symbol of zorin (like in the picture below) and the laptop will shut down.

But if I press in the first time on" Try or install zorin os (safe graphics) " it will work and install. Please tell me the difference between the two options and the solution to install it with the first option.
Note that I have two graphic cards one of them is not working.

Safe Graphics uses the grub parameter "nomodeset" in order to allow the system to initialize enough to load the Graphics Drivers. Otherwise, the system may reach the Login Screen (requiring the use of the graphics drivers) prior to their initialization, causing the system to crash and not proceed any further.
Once your copy of Zorin OS is installed, you can set the parameter permanent:

sudo nano /etc/default/grub

Arrow key down to
and add the nomodset parameter so it looks just like:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"
Tap ctrl+x to exit the editor, then the y key to say yes to save, then the enter key to save the current configuration.
The terminal will revert to normal. Now, you must update the grub to make these changes apply:

sudo update-grub

Hello, can I contact you on Facebook what's your Facebook

I am not on facebook at all. I am easily contacted here, though.


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