[NAME]  And while you're inside the case to re-seat the video card, you probably should clear BIOS and install a new motherboard battery which may have died during the move. BTW: You said your monitor has VGA and HDMI ports. So why are you using VGA which is the lowest quality video? The image of your video card looks like it probably has an HDMI port to left of the blue VGA port, in the area [NAME] circled in red. So you should connect HDMI(video card)>HDMI(monitor) for better output.
I’ve been using my XPS tower for several years now. I just moved to a new location and plugged it in to turn it on. When I did, I got an unfamiliar error:  Attention: Unsupported video configuration detected.  I have made no physical updates to this system. Everything is as it was when I bought it. The monitor only has one possible place to plug into. The same place it’s always been. And yet, I’m getting this error and I don’t know why. I looked through the BIOS and couldn’t find anything that would relate to this. What can I do to remove this error and get into my system?
XPS 8700, Unsupported video configuration error