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I think NVIDIA drivers have been screwed up just from apt-get upgrade (8/17 and 11/17). Perhaps this process can overwrite the xorg configuration that the Nvidia installer injects.
Can be installed via apt from non-free (avoid unless the proprietary drivers don't work), but this is version 340 (stretch: 375 (8/17)) whereas NVidia offer version 367 384 (8/17).
Install as root after stopping x with service gdm stop. The installer will offer to rewrite your xorg config; do it.
Old version via non-free (not recommended, although it sounds like they are getting to be more up-to-date in stretch):
https://linuxconfig.org/nvidia-geforce-driver-installation-on-debian-jessie-linux-8-64bit
(when stretch comes: https://linuxconfig.org/how-to-install-the-latest-nvidia-drivers-on-debian-9-stretch-linux)
dudley:
alan:
1 x Gigabyte GT 710 DDR3 PCI-E 1GB Graphics Card @ 28.93GBP