[deleted]

[Magus]

[deleted]

[BoomerDutch]

Uhh this is just a geuss and based on experience I've had with uefi.

 

I'd believe it has to do with secure boot keys mismatch or something wrong with it.

 

You can try reset secure boot keys that might fix the uefi issue with gpu.

 

I've only experienced this when I'm doing gpu passthrough with uefi on that I've have to add key to MOK in order to get it working however doesn't always work so I've always resetted the secure boot keys and it proceeded to linux install with gpu functioning.

Which i have to mention this is linux related but might be different situation but same problem.

 

So by resetting secure boot keys may require reinstalling windows.

 

You can use this method later once other users have provided easier solution but not fixed yet you can use this as last resort.

 

So i hope this works for you.

[SpookyCitrus]

A 1660 Super should be compatible with UEFI no problem. UEFI was the standard long before that GPU came out. When you cleared CMOS how did you do it, jumping the pins or unplugging from wall power and removing the CMOS Battery? If all you did was jump the pins to clear it, unplug the system from the wall and remove the button battery from the motherboard, leave out for a few seconds and press the power button a few times for good measure. Put the battery back in and reboot, that should for sure reset it. If that is what you did or it still doesn't post after that, something else is going on most likely another component is having an issue or the board just took itself out. More troubleshooting is needed.

[Mark Kaine]

14 minutes ago, Magus said:

Research on the topic pointed me in the direction of a GPU with a vBIOS that is somehow not UEFI compatible.

that's... not a thing afaik...  

 

this sounds like some secure boot / bitlocker shenanigans instead. 

 

why don't you just reverse the process?  install windows 10 with rufus, but leave csm enabled? 

 

 

[Magus]

[deleted]

[Mark Kaine]

19 minutes ago, Magus said:

Since I disabled CSM and cannot get into the UEFI to re-enable it, I no longer even have the option of just keeping CSM enabled and using Windows 10 instead

so... tldr is: you can get into windows, but not into the motherboard bios?  (i fail to see how the gpu matters here?)

 

20 minutes ago, Magus said:

Now the computer won't boot and I cannot get a UEFI screen at all.

The "boot" indicator light will be stuck on upon each boot, indicating boot device failure.

boot device is typically a harddrive, not a gpu.

 

 

[Magus]

[deleted]

[SpookyCitrus]

7 minutes ago, Magus said:

Jumping the pins is what I was doing at first, since the CMOS is under the GPU, but after repeated failures I did take it out properly.

And yes it was fully powered off and unplugged when doing so. CMOS resetting is definitely just not fixing the issue.

 

I do hope it's not a motherboard failure of some kind.

Just to clarify you are not getting a post or a boot at all, the system powers on but doesn't display anything correct?

 

If CMOS reset doesn't work the next step is testing other components, unplug unnecessary components, RGB strips/accessories, secondary storage drives, etc. Only leave what is necessary for the system to post hooked up. Double check power cables from the PSU to the motherboard and GPU, remove a single stick of ram so that you only have one installed and attempt to post again. If it's still not working in the bare minimum configuration you'll then want to reseat all components. CPU, GPU, RAM, power connectors, M.2 SSDs, etc. If that doesn't change anything you'll need to test new components in the system, GPU, Ram, CPU, motherboard try to determine what has failed. Alternatively if you don't want to deal with the troubleshooting yourself you can take it into a shop and have them do it.

[Magus]

[deleted]

[BoomerDutch]

11 minutes ago, Magus said:

Correct. To be more specific, the green "boot" light is stuck on, which according to the manual indicates a boot device issue.

The screen is flashing on and off constantly, almost as if the GPU is doing something but clearly not what it should be doing.

I attempted to connect via the DVI output on the GPU (rather than HDMI), same behavior.

 

CMOS reset does not alleviate the issue. Nor does a boot with minimum hardware attached (this CPU requires a GPU for display output).

It really is coming down to just trying with different hardware.

Yeahh looks like it, so yeah a cpu is great but not for troubleshooting so yeah you have to switch gpu or switch with temporary old cpu with graphics in order to fix or replace motherboard entirely and let someone else solve it.

[Magus]

[deleted]

[Magus]

[deleted]

[Mark Kaine]

latest bios might have looked out your cpu (its possible) 

does the mobo have bios flashback? 

 

and as for "booting" its still not clear to me if you actually tried to boot from a windows (rufus or otherwise) install media?.

 

just checking possible causes/solutions before you buy another cpu/gpu.

[Magus]

[deleted]