Followed a Windows 10 update reset tutorial - computer won't boot

I'm going to try and keep the story short.

I am using the Windows Insider preview 20.04

I followed a tutorial on how to reset the windows 10 update (I'm sure it's nothing to do with the method, just my system didn't like it)

I downloaded the reg file, and then it was flagged out by my anti virus that a virus has been deleted so i disabled the anti virus and tried to download it again. The Microsoft edge smart screen removed it so i used Firefox instead and downloaded and installed it, followed the procedure as described and pressed the key as recommended to restart and from there it never came back, the computer doesn't want to boot up - no bleeping sound.

This is what I've done since - I unplugged all devices connected and I removed all the memory sticks and left just one, I then disconnected the hard drive and all other cards except the graphics card but nothing happened - no posting or bleeping, I did clear the CMOS but still no posting.

Is the motherboard gone? Or is there anything I can do to investigate further?

I forgot to mention that all the fans are working and the light on the motherboard are on. The motherboard is ASUS Z170 pro gaming Intel i5 and I have 16GB of ram.

Please help!