Uh oh...
Six hours later it's back up but my graphics card is knackered.
Thanks MWO, you killed my PC!
Grrrrrr.....
For all those who are wondering about my poor old PC here's a link to the config.
TLDR? W10, i7 4790, Z97, 32gb ram, GeForce GTX 760
Here's the specific graphics card from the supplier - bought in Dec 2014
https://quietpc.co.u...x760h1042-1042j
and there was no overclocking malarky, that's far too difficult for me.
Edited by Dogstar, 15 March 2018 - 12:23 AM.