All colours Win 10 changed

  dangerusone 20:55 28 Sep 2018

I have a HP Compaq SFF 4300 i3 ex business Pc running Windows 10. this has been running fine untill yesterday When all the colours went crazy, there is a greenish tinge to the fonts and such as the FireFok icon has lost the red section turning to yellow. I have tried googling about this and all I get is "Settings/Display which doesn't help. I've tried system restore with no luck. I've tried another PC with the monitor OK, tried putting an old 80GB HDD with Win 7 on, no good. Are the graphics to blame and what can I do about it?

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