new Pc D3 giving d3d error cant play was okay few weeks and runs d4 and other game perfectly. Already scan and repair said nothing wrong . restarted pc 2 times nothing again . what to do ??
I mentioned in another post:
At D3 Battlenet click on the Option Wheel, click Game Settings, Click Reset In-Game Options.
Try then start the Game.
This works it for me.
Yesterday I got a Nvidia-driver update.
Perhaps that caused the issue.
Hope it helps.
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Thanks that helped me too with the d3d error. 
thank youu so much it worked indeed . i missed the post where you mentioned. tyvm