black screen on boot

Hi guys, i try to found the same problem in the forum but i don't found Im trying to install mac os big sur I made all steps for prepare for install mac, but after read some codes the screen goes black. I send a video for you guys see exactly what rappen, may be you guys can help-me...

Screen works only after plug out/in - Mountain Lion Hi, i am silently reading this forum since a long time and set up a few Hacks over the years.. Usually i find everyting through the search function - but not now.. I was running a hack on Lion and Snow Leopard without Problems...