I'll just get to the point.

I've just had some crazy issues when trying to setup SLI in my new system.

1. I powered my PC down. I took out my Asus Strix 1080 then took out my riser cable and slotted the card into my motherboard.
2. Installed the Second Asus Strix 1080 in the second PCI-E slot and clipped on the HB SLI bridge.

Now the system won't detect any GPU at all. Even just with the original GPU installed.

I connected with a USB monitor and I'm able to boot into Windows fine but I cannot access the BIOS with the USB monitor.

I have tried Uninstalling the previous gpu drivers with DDU and installing Nvidia drivers but no GPU is detected. I can't see any GPU in Device Manager or Task Manager.

I also tried both cards in another system and they work 100%

Edit : I tried resetting the bios now I'm stuck at debug code : Ab and there is no way for me to see the bios screen.

Herewith my PC Specs :
Intel I9 9900KF
EVGA Z390 FTW (I did plug in the extra 6-pin power at the bottom of the mobo for load balancing when using SLI)
4 x 8 GB Corsair Vengeance Pro RGB
Corsair 1200 HXi 1200 watt

I have tried both slots with one card and still no display output after attempting SLI. I can confirm both cards work individually in my other system.
After clearing the CMOS and flashing the stock BIOS I'm stuck with Debug Code: Ab - Setup Input Wait
I cannot access the Bios with my USB monitor.

I'll give this a try when I get back to the system later today thank you.

It's still not going past the Debug Code: Ab - Setup Input Wait

bob16314

ScuBaLlama
I cannot access the Bios with my USB monitor.

Guessing that's probably the whole deal right there.
 
Roll with a DVI, HDMI or Display Port output from that card.
 
One of the F keys might get you past that error.
 
 
 

 
I have tried all the F keys with a combo of F10 and Enter and nothing. I even tried 2 different keyboards.
I've tried 4 different GPU's and all the outputs on them and still no display whatsoever. Also tried VGA/DVI/Displayport combos with no luck.
 
I can't seem to see any physical problems with the PCI-e slots or the CPU socket See Images here: 
 

coolmistry

ScuBaLlama
I'll just get to the point.

I've just had some crazy issues when trying to setup SLI in my new system.

1. I powered my PC down. I took out my Asus Strix 1080 then took out my riser cable and slotted the card into my motherboard.
2. Installed the Second Asus Strix 1080 in the second PCI-E slot and clipped on the HB SLI bridge.

Now the system won't detect any GPU at all. Even just with the original GPU installed.

I connected with a USB monitor and I'm able to boot into Windows fine but I cannot access the BIOS with the USB monitor.

I have tried Uninstalling the previous gpu drivers with DDU and installing Nvidia drivers but no GPU is detected. I can't see any GPU in Device Manager or Task Manager.

I also tried both cards in another system and they work 100%

Edit : I tried resetting the bios now I'm stuck at debug code : Ab and there is no way for me to see the bios screen.

Herewith my PC Specs :
Intel I9 9900KF
EVGA Z390 FTW (I did plug in the extra 6-pin power at the bottom of the mobo for load balancing when using SLI)
4 x 8 GB Corsair Vengeance Pro RGB
Corsair 1200 HXi 1200 watt

No it will not working. This is for support 3-way Sli or 4  but for Two Ways Sli which no need that cause boot up!!!
Please have a look in manual book
I remember my Old MSI Xpower do have those 6-pin PCIe which I used this for 3-Ways SLi when I have remove third card and make 2-Ways Sli it stop working so I have to remove 6-pin PCIe cos it which support more than two cards!!!! 

Please let me know if this is wrong?
 
Quoting from page 36: 
Although the Z390 FTW does not support 3-way or 4-way SLI, connecting a 6-pin PCIe connector is recommended if running two or more high-end graphics cards in SLI

coolmistry

ScuBaLlama

coolmistry

ScuBaLlama
I'll just get to the point.

I've just had some crazy issues when trying to setup SLI in my new system.

1. I powered my PC down. I took out my Asus Strix 1080 then took out my riser cable and slotted the card into my motherboard.
2. Installed the Second Asus Strix 1080 in the second PCI-E slot and clipped on the HB SLI bridge.

Now the system won't detect any GPU at all. Even just with the original GPU installed.

I connected with a USB monitor and I'm able to boot into Windows fine but I cannot access the BIOS with the USB monitor.

I have tried Uninstalling the previous gpu drivers with DDU and installing Nvidia drivers but no GPU is detected. I can't see any GPU in Device Manager or Task Manager.

I also tried both cards in another system and they work 100%

Edit : I tried resetting the bios now I'm stuck at debug code : Ab and there is no way for me to see the bios screen.

Herewith my PC Specs :
Intel I9 9900KF
EVGA Z390 FTW (I did plug in the extra 6-pin power at the bottom of the mobo for load balancing when using SLI)
4 x 8 GB Corsair Vengeance Pro RGB
Corsair 1200 HXi 1200 watt

No it will not working. This is for support 3-way Sli or 4  but for Two Ways Sli which no need that cause boot up!!!
Please have a look in manual book
I remember my Old MSI Xpower do have those 6-pin PCIe which I used this for 3-Ways SLi when I have remove third card and make 2-Ways Sli it stop working so I have to remove 6-pin PCIe cos it which support more than two cards!!!! 

Please let me know if this is wrong?
 
Quoting from page 36: 
Although the Z390 FTW does not support 3-way or 4-way SLI, connecting a 6-pin PCIe connector is recommended if running two or more high-end graphics cards in SLI

That right! I have try plug on my Z370 classified it will not boot up so had to remove 6-pin PCIe then it working...I sure it for 3 or 4-Ways as we don't have one thought! 

I have removed it but it still doesn't have any display on any GPU in any slot I try.

Hang on I have notice that you are using HB SLi Bridge? I think motherboard not support HB Sli Bridge only Sli Bridge....
 

Have you disable Intergraphics in your BIOS setting make sure not set to Auto so set to Disable?

ScuBaLlama

coolmistry
Hang on I have notice that you are using HB SLi Bridge? I think motherboard not support HB Sli Bridge only Sli Bridge....
 

This doesn't matter anymore as I can't even get display out on either of the PCI-e slots with the 4 Gpu's I tried.

I don't think you get much of a performance difference between a HB Sli bridge compared to 2 x ribbon sli cables.

Are you sure you have plug on GPU not on motherboard? If so try swap round GPU card if you haven't try?

ok so let plug on your intergraphic motherboard and to boot up if it working then try set to disable intergraphic in your BIOS setting the save but do not restart just shut down then plug back on to gpu to try boot up...
EDIT> sorry you don't have one cos your CPU is 9900KF!!!!! 

It strange how come it working before you add second card  Have you try contact EVGA customer support yet Maybe that Sajin said Bad PIC-e...

ScuBaLlama
I'm in comms with customer support at the moment. Sent them pictures to verify with the technical team. I'll have to wait until Monday to get feedback.

Good luck and let us know how getting on 

ScuBaLlama
Some back and forth with EVGA support and I'm finally processing the RMA.
 
I hope shipping the board back to Germany isn't too expensive! 

That good to hear! Ermm I sure they paid the shipping!! I think they send your replace board and you will send back the faulty one!! 
Thanks for telling us