Question Error when Change Booting System to Uefi

[eses125]

I have a laptop without a screen, I use it on an external monitor using a vga output, its boot system was csm and I modified the BIOS to use another hard that boots via uefi and when saving the setting, I rebooted and the screen became black and there is no response, I tried several ways such as removing the RAM And cleaning static electricity is useless. Please give me a solution because I am really tired

 

[rgd1101]

can't replace/fix the screen?

 

[eses125]

can't replace/fix the screen?

No, I replaced the screen and used a new one, but it did not work. I think that the outlet is broken, and this is what the maintenance store said before, but the wire that connects the screen to it is hot, and there is another possibility, which is that the wire has the problem, but I was not able to test it on another device