Let us not be too pessimistic ! But if the computer is under warranty then you are better to speak to your supplier
You can tell if your desktop has integrated graphics very easily - take a look at the back panel. You should see the horizontal small panel where your present monitor cable connects and, normally to the left of that, you will see a vertical group of connectors - several USB, Ethernet, audio and hopefully at least one video connector. If there are integrated graphics you will almost certainly have a VGA connector which looks like this -
and possibly either an HDMI or a DVI connector. If you have a DVI connector then you won't need to source a VGA cable ! If it has integrated graphics, next remove the nVidia card.
While you are looking at the back panel take a look at the vertical edges, you should see two screws on each side. These may be 'thumb' screws or they may be cross-headed. Looking at the back panel, undo the two on the right hand side panel and remove them. The panel will then slide backwards about half an inch and lift off. Then remove the nVidia graphics card. If you look at the link in my #2 you will see a photo of your card so you will be able to recognise it ! This is held in by one cross-head screw and a clip at the rear of the card. Remove the screw and release the clip by pressing down and away from the card then remove the card by gently waggling it. Disconnect any power cables it may have connected to it. I don't think there are any but check. Next connect the monitor to the on-board graphics, boot the computer and see if there is an image on the screen. There is no need to replace the side panel while you are doing this.
If there is still no image your cable may be faulty - try another.
PS. The only effective way to test the video card is to plug it into a computer whose graphics are known to work and see what happens. If it works there the card is good, if it doesn't, it is an ex card, also known as dead.
Edited by Chris Cosgrove, 30 November 2017 - 10:51 AM.