Try adjusting your screen resolution.
In Mint LXDE you need to install a resolution changer.
Go to Terminal and type in "sudo apt-get install lxrandr" type in your password when asked.
Once it is installed go to Menu->preferences->monitor Settings.
Let me know how it works out.
HP a6619f, 4GB ram, 500 GB HDD, Nvidia GeForce 930 GS
Mint 13 Cinnamon 64