Vostro 15 5568 without screen

Someone have given me this computer but sadly the screen doesn't work. I have a spare standalone screen and I can see the computer works. I removed the screen since is death to just use the computer with the external screen, but the computer won't run much longer without sending a shutdown order, even with another screen plugged in. My space is limited so I can't really have two screens, specially is one of them doesn't work

Is there a way to get pass this warning and the automatic shutdown? I can even see the BIOS and such for like a minute+ before it goes off, so I have access to BIOS config. I also ran the diagnostic tool and it claims for the screen.

Thanks in advance for the time taken. I would really like to give some use to these still working machine. Getting a new screen is not a feasible option right now but I'm open to suggestions.