Check Dell support website
Is there a reason why you can't check the Dell support website for detailed info you're looking for? It will be there and I provide the webpage it leads to:
You can also use your service tag#, enter it and follow the website for what you need for other items. Isn't this PC an AIO type, isn't your display not working. If so AND WHAT IS FOUND ON MANUAL @WEBSITE, you need to replace the video card in order to get it to work or if you find no ext. video port, that option was part of yet another video setup. basically, does yours have any at all?