When you boot the computer, does the hard drive activity light flash?

According to the specs I have seen, there should be a slot to add a video card.

The manual for the computer can be found here:

https://dl.dell.com/topicspdf/xps-89...uide_en-us.pdf

If you look at page 10, you will notice that it indicates the computer should be supplied with a video card from the factory. Please check to see where the monitor video cable is plugged in to the computer. If it is plugged in to the slot labeled #2 on the diagram, then it is connected to an add-in video card. If that is the case, plug the cable in to the appropriate socket in area #1 on the diagram, as new Windows installation will probably be using the video adapter on the motherboard, since no drivers for the add-in video card are likely to be installed.

If the video cable from the monitor is plugged in to the onboard video adapter socket in the group of sockets in area #1 on the diagram, then try the socket on the video card to see what happens.

Report back where the video cable from the monitor was plugged in to the computer, and any results of moving it.