QUOTE(SubRosa @ Apr 4 2020, 12:19 AM)

I see three possibilities here.
First, it could be your monitor. Try plugging the monitor into your laptop. You might have to use a different cable, since laptops often only have a VGA port. In any case the laptop can use the external monitor. Usually it automatically switches to one if you close the lid of the laptop. Though you might have to go into the laptop's video properties to set up the monitor. If the laptop cannot see the monitor at all, then that is probably your issue.
It might be your video cable. First up, check to make sure it is firmly plugged into both the monitor and computer. After that, it is the cheapest thing to replace.
Finally, it might indeed be your graphics card. The integrated graphics you read about is the video card that is built into your motherboard. Most PCs come with one. They tend to be cheaply made and terrible for gaming. This is as opposed to a video card that you buy and install into the motherboard. To switch to the integrated graphics, you have to move your monitor cable to from your add on video card to the video port that is built into your motherboard. Otherwise you are going to get nothing.
So the first question here is do you have a graphics card + the integrated graphics, or just the integrated graphics to begin with? You can tell by looking at the back of the PC. The integrated graphics port will often be at the side of the case. You will probably see a bunch of other ports for things like usb and audio and power running along the same side of the case with it. That is because they are all built into the motherboard, and so they all sit in the same place on the case as the board.
Your add on video card will typically run at a right angle to that, so if you have a tower case, it will sit horizontally. You will see a row of little horizontal slots in the back of the case. The add on card will occupy one. They will often have several different styles of video ports, like hdmi, vga, dvi, etc...
I just tried to take a picture of the back of my PC to give you an idea, and it turns out I don't have an integrated graphics card at all!
Here is a sample pic. The integrated graphics port is under that person's finger. That blue cable is a VGA monitor cable. The external graphics card is under their thumb. Those are two DVI video ports.
If you just have the integrated graphics then you are kind of out of luck. I would say try buying an add on video card, and hope that it is just the integrated graphics, and not the entire motherboard.
If you have add on card, and your video cable is plugged into that, move it to the integrated graphics port. You might have to remove the video card too, but I would just move the cable first and see what happens.
So in short, I recommend the following:
Make sure the video cable is in tight at both ends.
Move the cable.
Replace the cable.
Plug the monitor into laptop and see if it works. If it works, your monitor is good. If not, it is probably a bad monitor. See if you can borrow a monitor from your son or a neighbor too and try that.
Buy a new video card.
Okay, the computer has an Nvidia GeForce GTX 780 Ti graphics card installed; plus is supposed to have integrated graphics. It has worked just fine since 2015 when I bought it = just suddenly went out mid game last night.
I didn't know to try moving the monitor when I turn on the Integrated graphics in the BIOS; I'll try that.
The monitor is old; the only hookup it has is one of those old time fat connections that you plug in and then screw down. Unfortunately, my laptop has no adapters for that, urk.
I did try hooking up an HDMI cable to the PC and run it to the TV = got no signal at all on the TV.
Next = I have DirectX 11; which is suddenly saying that my graphics card is not supported by them even though it has worked fine for 5 years. When I ran a diagnostics to see why it wasn't supported suddenly after all this time it says:
DDI Version: unknown
Driver Model: unknown
That should be where the Video card is showing.
So either my video card is shot or it has somehow come loose or something = it isn't showing up.
It is showing in my Device Manager, but when I go to the NVidia site and download new drivers, I get an error message 003 and it doesn't change my screen issues (thousands of white horizontal lines on screen).
Also, my son noticed that he can move the mouse through those white lines and leave a trail where there are no white lines = not sure what that means; but he said that means it isn't the monitor because the mouse wouldn't effect white lines caused by the monitor.
Here is an image of my screen:
https://imgur.com/a/HVr76y9PS: Can't find any other place to connect the monitor; so = might not have it set up for integrated graphics, even though the BIOS shows it as having them.
PSS: Not sure if related; but = the day before this happened the PC fan kicked on and ran LOUDLY while I was in game; I shut the game off because I was afraid something might be overheating.