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My dual boot system is showing a black screen even before Grub 2

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I have a windows 10/Ubuntu setup, they are on the same harddrive.

What happens is, I press the turn on switch on my pc and most of the time it just shows me a black screen even before the grub2 menu to select the operating system I want to use.

Whenever I can select which OS I want to use and I select Ubuntu it shows me the Ubuntu logo and then it turns purple completely, thats because my graphics card is broken this happens when my display is switched to DP cause thats the outlet my graphics card uses, it also shows me a black screen with the ubuntu name and logo when i switch from Display Port to HDMI when ubuntu is running. If i use Windows, which runs on my integrated intel graphics it works fine.(Only if Im able/it allows me to boot into any OS).

When Iturn on my pc the keyboard lights up, in particular the light for the number pad and sometimes caps lock and another one, but once I hit any key to select a OS it turn of (the screen still doesnt show me anything) this is how I know it wont boot into any OS and Grub is not working.

I would be find using integrated graphics but i cant boot into any system cause of the black screen, I've tried hitting left shift, f12, ctrl+alt+f1 but all three haven't helped. Also ive hooked up a ubuntu installation usb drive to my pc but it didn‘t boot from it, I need to make changes to the BIOS for that but couldn’t access it. Can I fixe this issue with the BIOS screen if I can somehow make it there?

Thanks.

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