Hi doriaday,
Welcome to LQ!
Sometimes you just have to wait a few minutes.
The CIFS warning is probably harmless. If you ordered the laptop with Mint installed, there should be tech support available from the computer maker.
Once you get to the terminal (command line) try typing
and see if gdm3 is running. If it is, try:
Code:
$ ps aux | grep gdm | awk '{print $2}' | xargs sudo kill $1
and see if you can get the GUI running.
If gdm3 is not running, then try