PC cant install drivers, and GPU not responding

[MontyInHD]

The current situation is that I am only able to use the onboard graphics through a single VGA cable, the HDMI ports do not respond. As well as, the GPU (GTX 1080 STRIX) is rendered completely useless as I cant install new drivers, comes up with the compatibility error from Nvidia, and the GPU also doesn't appear in the Device Manager. There is an unknown device, which I searched up the Hardware ID of and it came up with this: " ACPI\VEN_PNP&DEV_0A0B ACPI\PNP0A0B *PNP0A0B" which from what I found is mobo related. I also deleted GPU Tweak, as before doing so it came up with a message: "Load vender.dll failed. Please install VGA driver" which I can only assume is the motherboards VGA driver, and after updating nothing changed.

Things I have also done:
*Delete old drivers to try to reinstall new ones - no luck
*Changed the PCI-E slot of the GPU - no effect still came up with the same errors
*Updated all drivers for the motherboard (which is a Z170-A)

So in the end, I really don't know what else to do. As of now, I'm wondering if it's better to get a new motherboard or a replacement if possible as I seriously cannot find any fix to this, so all help is appreciated.

 

[srimasis]

Looks like a faulty GPU. Try to use your GPU on a different PC just to be sure. Also try a different GPU on your motherboard just in case to know whether its the motherboard's fault.

 

[rgd1101]

What the OS? what the make and model of the psu?

 

[rgd1101]

MERGED QUESTION
Question from ediseybusiness : "Looking for Help - Pc Issue"

Hi all, so today I received a Samsung 850 SSD and was eager to install it. Once I had done so, everything seemed to be working fine. But then after one last restart, I then noticed that none of my monitors were turning on. So I switched the DVI cable of one of my monitors to my mobo, so that I could actually get to the desktop. Once I did so, I was able to get to the desktop but got a message from ASUS you tweak with a vender.dll failed error. So I then googled a solution to that and after trying the ones I came across, none of them ended up working. I then proceeded to assume it’s a driver issue, and so used DDU to uninstall any broken drivers, again: didn’t work. I then went to the bios and to see if I could gain anything and all I found was a list of PCI-E slots saying no VGA card.

So right now I’m lost as to what to do, I’ve also installed and reinstalled the GPU itself as well as trying to install it into a different PCI-E slot, and that gave the same result.

So any help is appreciated

Some of my Specs:
CPU: i7 - 6700k
Mobo: Asus Z170
GPU : GTX 1080

Double check pcie power cables?

 

[MontyInHD]

What the OS? what the make and model of the PSU?

OS: Windows 10 64-bit
PSU: EVGA SuperNova 650 G2

 

[MontyInHD]

After taking srimasis' advice, I put the GPU into another PC and sure enough, the exact same results occurred, narrowing down the only culprit to be the GPU - thanks for the help.