Blank screen after enabling secure boot

[Guest aaaaa aaaaaa]

First i switched from MBR to GPT and tried booting my computer it worked fine. Then i turned off CSM and turned on secure boot asked me to change something with the PK key which i did it was the pk management key i believe it said successful i restarted my pc to find nothing on the screen. took out the cmos battery for 5 minutes tried booting up using HDMI on the motherboard that did not work. tried taking out the GPU and running just off the motherboard but that did not work either.

 

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