Monitor is recognized despite no image

Hello everyone. :grinning:

I have been using Manjaro for a year now, but my setup was clean and working perfectly.
I wanted to try something by connecting a IBM SurePoint 4820 to my HP Compaq Pro 6000 SFF.

Here’s the problem: when I plug the monitor, I can see that it’s being detected by the system, but the screen remains black (the monitor got the green light, meaning it receive a signal). I also tried to install TeamViewer to remote control my computer despite having no monitor and changed some settings, without success. :frowning_face:

But the best is: when I unplug the VGA cable from my computer, I can briefly see my desktop for something like 0.3 or 0.5 seconds! Like Manjaro detected that the Monitor has been unplugged then applied some settings or thing…

Do you guys can help me to find a solution ?

Thanks a lot. :grinning: