hello, i have a dell optiplex 5250 aio series with a broken screen and i want to get the image through the hdmi port to use it but i can't, it detects it as a second screen.

I have opened the computer and disconnected the broken internal screen from the flex cable but nothing, it still detects the hdmi output as a second monitor.

Can I use this pc without its original screen only getting the image through the hdmi port?