ubuntu 16.04 shuts down after a few minutes

Trying to run 16.04 on my Intel I7-6700HQ 4x260GHz, Nvidia GeForce GTX965m. It works fine on 15.10, but when I boot up 16.04 from the USB, the fan just starts ruing and runs full-bore until the machine tus itself off after about a minute. The same thing happened on 14.04. I'm assuming it's something to do with support for the chipset, but since it works in 15.10, I would have assumed it worked in 16.04? Anyone got any experience of this?