disable screen going blank and mouse cursor

Open up /etc/lightdm/lightdm.conf using your favorite text editor (sudo nano /etc/lightdm/lightdm.conf)
Look for the line #xserver-command=X below [SeatDefaults]. Change it to xserver-command=X -nocursor -s 0 dpms
It should be at line 87 if things don't change
Save (ctrl-o), quit (ctrl-x) and reboot