If you haven’t tried these - there are 2 post install steps you should do. One - run updates...make sure you have a green check mark in the lower right notification area. If its a blue exclamation point - click it, enter your system password - and let it run. That initial batch of updates solves a lot of problems - especially boot issues.
If you continue to have problems - check to see if there are any proprietary video drivers available for your video card. I think there is a menu link under “Administration” called “Drivers”. Click it - and it will tell you if there is a driver available...I’m generally pretty happy with the stock generic video driver - pretty solid these days.
Hi GG- Yes I did both of those right after fresh install- runnign latest NVidia drivers (Which isn’t as easy to do in Mint 18.1 as the new software update PPA doesn’t allow the old PPA for the drivers to load- You have to install mint, run the command liens to load the driver PPA- then update linux- otherwise it won’t work- it was a bit of a pain to find the solution- but eventually got it)