Question changed the platform key the image disappeared

[Windad189]

I decided to try to enable Secure boot
I went into the bios, went to the secure boot settings, selected a custom mode, went into the keys and clicked update the Platform Key
After that, the picture disappeared, the coolers worked
Now, when you turn on the PC, the coolers start working and that's it
There is nothing on the monitors, even the keyboard and mouse apparently do not work, they do not glow.
Bios tried to reset, took out the battery, clamped the contacts did not help
I tried to start without a video card, nothing has changed on the motherboard's graphics
Changing the RAM slot didn't help.
I will be glad to absolutely any help!!!
Windows 10
Percent amd ryzen 5 2600
Mother gigabyte B450M DS3H
gigabyte gtx 1050ti graphics card
RAM 1 bar 8 GB
BP 450 W

 

[Fix_that_Glitch]

Do you have another gpu you can put in the pc?

 

[algedcf]

I have the exact d*mb problem same what happened to me after trying to update the platfrom key without saving. I hope it will be fix soon.