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GTX 970 Problems with the driver

Level 7
Hello 🙂

This is my first post here, hopefully I'm posting this in the right place 🙂

I just finished building a brand new PC.
Maximus VII Hero, i7 4790k, Corsair Vengeance 16GB Ram, 780W PSU and GTX 970 Strix DirectCU2 OC.

I had a lot of problems installing the drivers for the video card, i tried from the original CD and i also tried from their website and i got this error installer cannot continue, this graphics driver could not find compatible graphics hardware.

After this i changed in BIOS the Primary Display from Auto to PCIE and it worked, I installed the drivers, the ASUS GPU tweaker, I even installed WatchDogs to test the PC and it worked very good.
I also tested the video card, everything was good, in Device Manager under Display Adapters there was finally the GTX 970.

I turned off the PC and now when I'm turning it on the video card it's not working, the ASUS GPU Tweak says Fail to load dlls. Please install VGA driver. The GeForce Experience says Sorry, GeForce Experience could not find a driver for this PC. Also in Device Manager under Display Adapters there is no more GTX 970, it's now Microsoft Basic Display Adapter.

I checked in BIOS the settings are the same and at the Graphics Card Information everything seems ok.

I don't know what elso to do, i hope it's just a software problem. 😞
Any answers or advices will be greatly appreciated!
Thank you!

Level 7
UPDATE: If i change in BIOS the Primary Display from PCIE to AUTO, or the other way, it works. And if I put the PC in hibernate it works but if i restart it, everything starts again, I need to change again the settings in BIOS. It's not making sense for me. If somebody has any ideas or the problem please reply.