Is my GPU busted?

[Chickenbread]

I already posted here about booting issues with a different motherboard. I decided to RMA that board and get an Asus ROG Strix Z370-F Gaming.

I still have booting issues, even with the new motherboard. However they are not the same issues I had with the Gigabyte motherboard.

Instead of the system doing bootloops, the Asus motherboard decides to stay at GPU initialization, if more than 1 Monitor is plugged into the GPU. (I only have tested DP, since I'm short on HDMI ports on my monitors)

However, the system boots just fine with only 1 monitor connected, and continues to run without any hitches, even when I plug in a second monitor during run-time.

 

There are 2 reasons that lead me to believe, that my GPU is busted:

1. The Asus Motherboard doesn't show the POST screen and the VGA led stays lit
2. I had an incident a while back while installing the GPU into my old PC. But only the LAN-controller on that board got fried and the GPU worked fine.

The GPU works fine in my Z97 System (with a vary rare hickup at boot) and even runs an overclock on top of the factory OC but only within Windows.

Also worth mentioning is, that my Z97 system originally had issues booting with the Elgato installed, but that was a Windows only issues and was fixed by force-installation of the driver during safe mode.

Any ideas?

 

Here's my current configuration:

• Asus ROG Strix Z370-F Gaming
• Intel Core i7 8700K (not overclocked)
• 16GB Trident Z RGB Ram 3200MHz CL16
• Nvidia GTX 1060 6GB (Gainward Pheonix GS)
• NZXT Kraken X62
• Elgato HD60 Pro
• 250 GB Samsung 960 Evo
• 500 GB Samsung 850 Evo
• 4 TB WD Black

[Biggerboot]

See if there's a setting in your bios to force video display on discrete graphics instead of iGPU.

[Chickenbread]

Already set the BIOS to boot on the GPU and additionally enabled the multi-monitor support for the iGPU

[Biggerboot]

1 hour ago, Chickenbread said:

Already set the BIOS to boot on the GPU and additionally enabled the multi-monitor support for the iGPU

Do you need the MM support for the iGPU?  Try it without that first.  Sometimes that stuff will just make your system lock onto the iGPU.  Theoretically it shouldn't but sometimes it's just weird like that.

I would update the bios as well if you haven't yet.

[Chickenbread]

So I updated the BIOS yesterday, and it  seemed to boot fine. I also had the chance today to borrow and old FullHD DVI Monitor from a friend and even after disconnecting power it booted without problems (1x QHD via HDMI, 1x FullHD via DVI) however with 2 QHD monitors connected via DP it froze at the POST screen (at least an improvement over no screen) one reboot later and it booted fine with both DP monitors connected.

I honestly don't know whats going on anymore...