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BIOS settings/computer boot issue

C8M57UP#ABA
Microsoft Windows 10 (64-bit)
I was trying to set up a dual-boot with Ubuntu and changed some of the BIOS settings, but now the computer doesn't restart.
 
I think the problem is that I disabled the legacy boot settings. Now when I try to start the computer I get that the power button blinks red with 6 beeps a few times before stopping. However, the computer does not boot even after waiting for 15 min.
 
Any idea about how to fix this? 
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BIOS settings/computer boot issue

Hi:

 

Did you add a video card by any chance?

 

The 6 beep error code has something to do with the video.

 

You normally get that 6 beep error message if you disable legacy mode and enable secure boot.

 

See this link for more info.

 

https://support.hp.com/us-en/document/c03653200/

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