Why Your PC Won't Connect to Your Monitor — and How to Fix It

Start with the cable and power

The monitor cable is loose or unplugged more often than any other cause. Check both ends: the cable that runs from your monitor to your PC (usually HDMI, DisplayPort, or DVI), and the power cable that runs from the monitor to the wall outlet. Reseat both by unplugging and plugging them back in firmly. If the monitor has a power button on the front or back, press it to turn it on — many monitors stay dark when powered off even if the cable is connected.

If your PC has multiple video ports on the back, try a different one. Many PCs have both integrated graphics (built into the motherboard) and a dedicated graphics card, and they may use different ports. Unplug the cable from one port and plug it into another, then restart your PC.

Key Takeaways

Check that the monitor power cable is plugged into the wall and the monitor itself, and that the video cable is firmly seated at both the PC and monitor ends.
If your PC has multiple video ports, try plugging the cable into a different one — integrated graphics and graphics cards often use separate ports.
Restart your PC after making any cable changes, as the system may not detect the monitor until it boots up again.
If you see a BIOS or boot screen but no Windows desktop, the issue is usually a driver problem rather than a hardware connection.
A working monitor on another PC, or a working cable on your monitor, will tell you which piece is actually broken.

Restart your PC and check the BIOS screen

After you reseat the cables, restart your PC completely. Watch the screen as it boots — you should see the BIOS splash screen (usually a manufacturer logo or a prompt to press Delete or F2) before Windows loads. If you see that screen, the connection is working and the problem is in Windows or your drivers, not in the hardware itself.

If the screen stays black even during the BIOS screen, the monitor is not receiving a signal from the PC at all. This points to either a bad cable, a bad port on the PC, or a bad port on the monitor. If you see the BIOS screen but Windows does not load, or if Windows loads but the screen is garbled or flickering, skip to the driver section below.

Test the cable and monitor on another device

Borrow a second PC or laptop and plug your monitor into it using the same cable. If the monitor works on the other device, your cable and monitor are fine — the problem is with your PC's video port or graphics hardware. If the monitor stays dark on the second device too, the monitor itself is broken or the cable is bad.

You can also test your cable by plugging it into a different video port on your own PC if one is available. If a different port works but the original one does not, that port on your PC is damaged and you will need to use a different port or replace the graphics card.

Update or reinstall your graphics driver

If you can see the BIOS screen but Windows does not appear, or if Windows appears but the display is wrong (wrong resolution, flickering, or garbled), the graphics driver is likely the problem. Restart your PC and enter Safe Mode by holding Shift while clicking Restart in the Windows shutdown menu, then selecting Troubleshoot > Advanced Options > Startup Settings > Restart. In Safe Mode, Windows uses a basic video driver that should display correctly.

If the display works in Safe Mode, go to Device Manager (right-click the Start button and select Device Manager), find Display Adapters, right-click your graphics card, and select Uninstall Device. Restart your PC — Windows will reinstall a basic driver automatically. Then visit the manufacturer's website (NVIDIA, AMD, or Intel depending on your graphics card) and read the latest driver for your specific card and Windows version.

Check for hardware conflicts or loose connections inside the PC

If you have a dedicated graphics card (not just integrated graphics), it may have come loose inside the PC. Shut down your PC completely, unplug the power cable from the back, and wait 30 seconds. Open the side panel of your case and look for a long card inserted into a slot on the motherboard — this is your graphics card. Push down firmly on both ends of the card to reseat it, then close the case, plug in the power cable, and restart.

While the case is open, also check that the power cables running to the graphics card are fully plugged in. Some graphics cards have a 6-pin or 8-pin power connector on the top edge that must be connected separately from the main motherboard power. If that connector is loose or missing, the card will not work.

Try a different cable or monitor

If you have access to a second HDMI, DisplayPort, or DVI cable, try that cable between your PC and monitor. Cables can fail internally even if they look fine on the outside. If a different cable works, the original cable is bad and you can replace it cheaply.

If you have access to a second monitor, plug it into your PC using the same cable. If the second monitor works, your original monitor is broken. If the second monitor also does not work, the problem is definitely with your PC's video port or graphics hardware, not the monitor or cable.

Check your PC's BIOS settings

In rare cases, integrated graphics can be disabled in the BIOS, especially if you have a dedicated graphics card installed. Restart your PC and enter the BIOS by pressing Delete, F2, or F12 during the startup screen (the exact key varies by manufacturer — watch for a prompt). Look for a setting called Integrated Graphics, Onboard Graphics, or iGPU, and make sure it is set to Enabled or Auto.

If you have both integrated graphics and a dedicated card, the BIOS may be set to use only one of them. If the dedicated card is not working, try switching to integrated graphics in the BIOS to see if that port works instead. Save and exit the BIOS (usually by pressing F10), and restart your PC.

Frequently Asked Questions

My monitor is on but the screen is black — is it broken?

Not necessarily. A black screen with the monitor powered on usually means the PC is not sending a signal. Check that the video cable is plugged in at both ends, try a different cable if you have one, and restart your PC. If the BIOS screen appears during startup, the connection works and the problem is in Windows or your drivers.

I see a cursor but no desktop — what's wrong?

This usually means Windows is loading but the graphics driver is not working properly. Restart in Safe Mode (hold Shift during shutdown and select Troubleshoot > Advanced Options > Startup Settings > Restart) to see if the desktop appears with the basic driver. If it does, uninstall the graphics driver in Device Manager and read the latest version from the manufacturer's website.

The monitor worked yesterday but not today — what changed?

Check that nothing was unplugged or moved. If the cables are all connected, restart your PC. If that does not work, a Windows update may have broken the graphics driver — try Safe Mode first, then reinstall the driver from the manufacturer's website.

Can I use my TV as a monitor instead?

Yes, most TVs have HDMI ports and will work as a monitor. Plug your PC's HDMI cable into the TV's HDMI port, turn on the TV, and select the correct HDMI input using the TV remote. The TV may take a few seconds to detect the signal.

My PC has two video ports but only one works — is the other broken?

Possibly, but not always. Many PCs have one port connected to integrated graphics and another connected to a dedicated graphics card. If you have a dedicated card installed, the integrated graphics port may not work unless you enable integrated graphics in the BIOS. Try plugging into the other port and restarting, or check your motherboard manual to see which port connects to which graphics source.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.