No video signal after enabling Secure Boot

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7 Sep 2020
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Hello, gallant ladies and beautiful gentlemen. It seems I've got myself into a bit of a quandary.

(PC: i5-9600kf, z390 Aorus Pro, Colorful 1070ti, two SSD drives, no HDD)

So, I enabled PTT, disabled CSM and enabled Secure Boot, needing to generate some keys along the way. After the last step, I couldn't get video signal (tried each of DP, HDMI and DVI; monitor confirmed good on a different computer), though everything else (cpu fans, case fans, gpu fans, keyboard lights, keyboard input, etc.) seems to work.

This seems to be a popular problem, and people report a number of different solutions, but none of them work for me.

Tried so far:
1) CMOS reset (10 minutes w/o battery, AC out, 10 minutes jumper on clear_cms pins, nothing)
2) different GPU (confirmed working on a different computer)
3) disks removed, only bootable USB (Win 10 installation stick) plugged into mobo ports

Nothing.

Unfortunately, I don't have a spare CPU with an iGPU.

Heck, I dug up an old Z370 Strix-H mobo, which should be fine. Well, it does look like one pin may be missing from the CPU socket and some traces of paste are also visible, but last time I had checked it had worked. Now it didn't. It actually behaved in a very same way (all fans spinning, LEDS lit up, etc., just keyboard didn't lit up), despite not having the same BIOS problem, obviously.

I'm pretty sure just enabling Secure Boot, even if gone wrong, can't really have fried the CPU or the RAM sticks or the PSU, or every single graphics card inserted in the slot on the Aorus (resulting in all those GPUs getting bricked and therefore not posting on the Strix either). I've checked the cables and plugs.

Any ideas?
 
You did make sure you connected the dusokat cables to the graphics card and not the motherboard, right? That's the only thing I could imagine, that something wasn't put back right.

From what I understand of PPT and secure boot, there is some involvement of the ME for storing keys, so I guess it is possible that is the problem with a CMOS reset not working.

Have you tried booting from the secondary bios on your board?
 
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