What to do if your new Desktop or Monitor shows a blank screen on first boot
1. This problem can be a result of having two video cables connected to the new desktop and to the monitor.
Only one cable should be connected from the computer to the monitor for display. Your desktop video card has multiple video ports; this allows the desktop to use multiple monitors. You do not need two cables from one monitor to your PC, shown in the example below (plugged into a monitor):
To resolve this, first, the desktop needs to be shut down. Hold down the power button for 10 full seconds (even if the display goes blank before then). This will power down the desktop and discharge the capacitors on the motherboard. While powered off, remove one of the cables from the computer and the monitor. If you have a cable that has ends that are blue, it is recommended to remove that cable. This is a VGA cable and compared to other connections that are possible, this has the lowest quality. Now press the power button to turn the desktop back on. Allow the computer to boot backup normally, now everything should display properly.
If the use of a second monitor is desired, shut down the desktop normally, reattach the second video cable to the desktop, and plug the other end into the second monitor. Power on the monitor, turn on the computer, and allow the desktop to boot up into windows normally. Refer to https://community.microcenter.com/discussion/2851/how-to-set-up-multiple-displays-in-windows-10/p1?new=1 to set up multiple monitors.
2. This problem can also be a result of your video cables being plugged in to the incorrect place on your PC.
When looking at the back of your PC, you will see plenty of ports, such as audio connectors, USB ports and video ports.
To determine where your video cables need to be plugged in at, it will depend on what your computer has -
In the example picture above labelled #1 is the onboard video ports on the motherboard. All ports will be labelled next to their port with symbols/text such as DVI, HDMI, DP and VGA.
You will only plug directly into these if you do not have any video ports below the audio jacks/USB ports on your system (labelled #2) - this would be a dedicated graphics/video card.
If there is a video card in your system, you will plug any monitors directly into the video card. They cannot be plugged into the motherboard (#1 on the picture above), only into the ports available on your video card.
If you cannot find the ports you are looking for on your video card, they may be covered/capped, which is very common a new computer/video card. In the example below, one of the DisplayPort (top port here) and DVI port (bottom port here) are covered:
If this is the case, simply pull those covers off and reveal the available video ports. These ports being covered do not mean the ports are unavailable/do not work.
Once the cover is removed, the port(s) are revealed and ready for use! Feel free to leave the caps on any unused ports if you'd like, just remove the ones you wish to use..
Simply plug your desired cable into one of the ports on the video card. If the PC is on, hold in the power button for 10 seconds, then boot it up normally again and you should get a display on your monitor now.