Question Can't boot after enabling Secure Boot

[V7X]

Hello.
I wanted to update to windows 11, so I went through the process of enabling TMP 2.0 and secure boot. Enabling TMP 2.0 went fine and it boots perfectly. Once I enabled secure boot (also had to modify some other related settings in order to access secure boot, like CSM or something and updating the factory key) I got SB to enable on bios, but once I save and reset (restart to windows) that's when it went downhill.. The PC no longer boots at all, not even to bios, and the first thing you see or rather hear is 5 beeps indicating an error. A quick search says it's a CPU error.

I'm running this rig by the way:
Aorus Z390 Ultra, i5 8400, Nvidia GTX 1650, 16gb (2x8gb) DDR4 RAM (Dual channel, 2800mhz) and run win10 on a 128gb sata ssd.

I tried mostly everything I could at this point from multiple restarts to removing the CMOS battery for 5-10 minutes while hitting the power button regularly to drain electric charges. Nothing works. Did that twice, the first time it took 30 seconds to make the beeping sounds. The second time I did this it waited 10 seconds to seemingly restart and then immediately made the beeps again.

The PC is about 3 years old now, but doubt that's the problem. Any help is appreciated immensely.

 

[SkyNetRising]

Any help is appreciated immensely.

Remove graphics card and boot using integrated graphics.
Go into BIOS and revert your modifications.
Should be able to boot into windows after that.
Show screenshot from Disk Management
(upload to imgur.com and post link)

 

[V7X]

Remove graphics card and boot using integrated graphics.
Go into BIOS and revert your modifications.
Should be able to boot into windows after that.
Show screenshot from Disk Management
(upload to imgur.com and post link)

I did this while I was away and yes I indeed got to boot into bios but it no longer detects a bootable drive (my sata ssd is my win 10) and now it's completely oblivious to this. Thanks for the actually correct reply, any further help will help. I'm pretty sure it's corrupted and I'm looking to try installing windows again somewhere using a cd/usb

 

[SkyNetRising]

How many drives? What models? Any M.2 drives?

Show screenshots from BIOS.

 

[V7X]

How many drives? What models? Any M.2 drives?

Show screenshots from BIOS.

I have one 128gb sata ssd and two 1tb hard drives, no m.2 drives.
Well, I put the GPU back to see if anything would happen and still same issue, and I tried to install windows somehow again but I never had it detect any bootable drive so yeah. I got the PC ready to take it tomorrow to my local hardware store to get this dealt with because I'm not very faithful that I could fix this on my own anyway. Thanks everyone for the help I'll make sure to update this with any solution I find. So far I think my windows is corrupted and my graphics card might just be short circuited or fried. Again, I'll update this once everything clears up.

 

[V7X]

Update: I'm at my my local store currently and thankfully the PC boots just fine. Surprisingly, nothing is damaged or fried and I actually have no idea how it ran with the GPU installed, and neither does the expert. He just turned it on without the gpu to make sure it's fine, then added the gpu to diagnose the beeping for himself, only to realize it runs just fine. I'd guess it's because the CMOS battery stayed overnight ON the MB but I already did everything prior to this. Mystery a bit far from being solved...