A DisplayPort “No Signal” message usually means the monitor has power but is not receiving a usable video stream from the PC. The screen may stay black after startup, wake only after several attempts, work through HDMI but not DisplayPort, or lose picture when Windows loads, a game changes resolution, or the monitor wakes from sleep. Your PC may still be running normally in the background: keyboard LEDs respond, fans spin, audio plays, or you can connect remotely.
This is usually not an emergency hardware failure. In 2026, most DisplayPort no-signal cases still come down to the selected input, a loose or marginal cable, a monitor power-state issue, an incorrect graphics output, or a display mode the monitor cannot accept. Start with the simple physical checks before changing drivers, BIOS settings, or Windows configuration. If the display went black immediately after a GPU upgrade or a system crash, avoid repeatedly force-shutting down the PC until you have checked the cable and output connection.
Likely Causes
| Cause | How to confirm | Fix difficulty |
|---|---|---|
| Wrong monitor input selected | Monitor menu shows HDMI, USB-C, or Auto instead of the connected DisplayPort input. | Easy |
| Loose, damaged, or low-quality DisplayPort cable | Picture returns after reseating the cable, using another cable, or lowering refresh rate. | Easy |
| Monitor or GPU stuck after sleep/power loss | Monitor works only after unplugging power or restarting with the monitor already on. | Easy |
| Cable connected to motherboard instead of graphics card | Dedicated GPU outputs are lower on the rear panel; motherboard outputs sit near USB/audio ports. | Easy |
| Unsupported resolution, refresh rate, HDR, or adaptive-sync mode | Display works in BIOS, Safe Mode, or at 60 Hz but goes black in normal Windows. | Moderate |
| Driver, firmware, GPU seating, or monitor hardware problem | Multiple known-good cables and ports fail, including before Windows starts. | Moderate to advanced |
Fix 1: Select the Correct DisplayPort Input
What causes it
Many monitors have more than one video input, such as DisplayPort, HDMI 1, HDMI 2, and USB-C. Auto input detection can fail after a power outage, a console was used on another port, or the PC resumes from sleep. Some displays also distinguish between DP 1.2 and DP 1.4 modes in their on-screen menu.
How to check
Press the monitor’s Menu, Input, Source, or joystick button. Look for an input label such as DisplayPort, DP, or DP 1. If the menu says “No Signal” while HDMI is selected, the monitor is listening to the wrong port.
What to do
Open the monitor’s input menu and manually select the exact DisplayPort connector in use. Do not rely on Auto Select during troubleshooting. If the monitor offers DisplayPort Version, DP Mode, or DisplayPort 1.2/1.4, start with the default or Auto setting. For older GPUs, try DP 1.2; for high-refresh or high-resolution displays, use DP 1.4 if both the monitor and GPU support it.
How to undo it
Return to the same Input or DisplayPort Version menu and select Auto, the previous input, or the prior DP mode.
Fix 2: Reseat the Cable and Perform a Full Power Reset
What causes it
DisplayPort performs a link handshake between the GPU and monitor. A partially inserted plug, bent connector pin, unstable cable, or monitor standby bug can interrupt that handshake. Unlike HDMI, DisplayPort cables often have a locking tab, so a cable can look connected while not being fully latched.
How to check
Turn off the PC and monitor. Inspect both ends of the cable for looseness, damage, or strain. Gently press each connector in; a locking DisplayPort connector should click into place. If the cable feels unusually hot, kinked, or loose in the port, do not continue using it.
What to do
Shut down the PC completely. Turn off the monitor, unplug its power cord, and disconnect the DisplayPort cable from both devices. Hold the monitor’s power button for 10 to 15 seconds, wait at least 60 seconds, then reconnect power and the cable. Connect the monitor directly to the graphics card without a dock, KVM switch, coupler, extender, or adapter. Start the monitor first, select DisplayPort manually, then start the PC.
If possible, test a short, certified DisplayPort cable. For a 4K high-refresh monitor, use a cable rated for the display mode you intend to run; an older cable may work at 60 Hz but fail at higher bandwidth settings.
How to undo it
No software changes were made. Reconnect any dock, KVM, or extension only after the direct connection works reliably.
Fix 3: Confirm You Are Using the Graphics Card Output
What causes it
Desktop PCs with a dedicated NVIDIA, AMD, or Intel Arc graphics card may also have video ports on the motherboard. If the monitor is connected to the motherboard, it may show no signal when the integrated GPU is disabled in BIOS, unavailable on that processor, or not configured as an active display device.
How to check
Look at the rear of the PC. Motherboard video ports are grouped near USB ports, Ethernet, and audio jacks. Dedicated GPU ports are usually lower on the case in a horizontal row, aligned with the expansion slots. If your graphics card has several DisplayPort connectors, try a different one.
What to do
Power the PC down, move the DisplayPort cable to a port on the dedicated graphics card, and restart. If you use multiple monitors, connect only one monitor to one GPU DisplayPort output for the first test. Disconnect HDMI displays temporarily because some older GPUs prioritize a different output during startup.
How to undo it
Move the cable back to the motherboard output only if you intentionally use integrated graphics and have enabled it in BIOS. Common BIOS labels include Integrated Graphics, iGPU Multi-Monitor, or Initial Display Output.
Fix 4: Reset Windows Display Detection and Projection Mode
What causes it
Windows can retain an old monitor layout after a driver update, docking change, remote-desktop session, or display crash. The PC may be sending the desktop to a disconnected screen, using Second screen only, or failing to redetect the monitor after wake.
How to check
With the PC running, press Windows + Ctrl + Shift + B. Windows should reset the graphics driver, often accompanied by a beep or brief screen flicker. Then press Windows + P, wait two seconds, press the Down Arrow once, and press Enter to cycle projection modes if you cannot see the menu.
What to do
Once you have an image, open Settings > System > Display. Under Multiple displays, click Detect. Select the affected monitor, then set Multiple displays to Extend these displays or Show only on 1, as appropriate. Open Advanced display and verify that the correct monitor is selected.
If the screen remains black but another display works, use Windows + P and choose PC screen only to force output to the primary display. Restart afterward with only the problem monitor connected.
How to undo it
Return to Settings > System > Display and restore your preferred multi-monitor arrangement, primary display, and projection mode.
Fix 5: Lower Resolution and Refresh Rate
What causes it
A monitor can lose signal when Windows or a game requests a refresh rate, resolution, color depth, HDR mode, or variable-refresh setting that exceeds what the monitor, cable, adapter, or selected DisplayPort mode can handle. This commonly appears after enabling 144 Hz, 165 Hz, 240 Hz, HDR, or a custom resolution.
How to check
Check whether the monitor displays the BIOS logo or Windows recovery screen. If it does, but loses signal at the Windows sign-in screen or when launching a game, the physical link is probably functional and the active display mode is the issue.
What to do
Boot into Safe Mode: interrupt startup three times to enter Windows Recovery, then choose Troubleshoot > Advanced options > Startup Settings > Restart and press 4 for Safe Mode. In normal Windows afterward, open Settings > System > Display > Advanced display. Select the monitor and choose a conservative refresh rate such as 60 Hz, then confirm the native resolution.
For NVIDIA, open NVIDIA Control Panel > Display > Change resolution. For AMD, open AMD Software: Adrenalin Edition > Settings > Display. Disable custom resolutions, HDR, and adaptive sync temporarily. In Windows, HDR is at Settings > System > Display > HDR.
How to undo it
Increase refresh rate one step at a time after the display is stable. Re-enable HDR, G-SYNC Compatible, FreeSync, or custom settings individually so you can identify the setting that caused the signal loss.
Fix 6: Clean-Reinstall the Graphics Driver
What causes it
A corrupted, incomplete, or incompatible graphics driver can fail during display initialization, especially after a Windows update, GPU driver update, or graphics-card replacement. If the monitor works before Windows loads but goes black afterward, suspect the driver before assuming the monitor has failed.
How to check
Boot into Safe Mode. If DisplayPort works there, open Device Manager > Display adapters. A warning icon, “Microsoft Basic Display Adapter,” repeated driver crashes, or a black screen only in normal mode supports a driver-related diagnosis.
What to do
In Safe Mode, open Device Manager > Display adapters, right-click the graphics card, choose Uninstall device, and check Attempt to remove the driver for this device if shown. Restart. Install the current stable driver package for your exact GPU from the GPU manufacturer, then restart again. During installation, choose the clean-install option if the installer offers one.
If you can access Windows on another display, also check Settings > Windows Update > Update history for a recently installed display driver. Use Uninstall updates only when the timing clearly matches the failure.
How to undo it
Use Device Manager > Display adapters > [your GPU] > Properties > Driver > Roll Back Driver if the prior driver was stable and the Roll Back button is available.
Fix 7: Test Ports, Firmware, and Hardware
What causes it
If no image appears even in BIOS, the problem may be a failed cable, defective monitor input, damaged GPU port, loose graphics card, insufficient GPU power, or firmware compatibility issue. DisplayPort firmware updates can matter on some older graphics cards paired with newer monitors.
How to check
Test the monitor with another PC or console-compatible source if available. Test the PC with another monitor. Try every DisplayPort output on the GPU and, if available, HDMI. If HDMI works but every DisplayPort port fails with multiple known-good cables, focus on the GPU’s DP outputs, driver state, and firmware.
What to do
Shut down, switch off the power supply, and unplug the PC. Remove the side panel and verify that the graphics card is fully seated in its PCIe slot and secured to the case. Confirm that every required PCIe power connector is fully inserted. Do not use a loose adapter or partially connected power lead. Then check the monitor manufacturer’s support utility or on-screen menu for a firmware version and follow its exact update procedure only if it specifically addresses DisplayPort compatibility.
How to undo it
Reseat the graphics card only if you are comfortable opening the system. If you changed monitor firmware, most monitors do not support downgrading; record the prior configuration before updating.
If Nothing Works
Reduce the setup to one monitor, one known-good DisplayPort cable, one GPU output, and no adapters or switches. Check whether you can see the BIOS or UEFI screen. If you cannot see BIOS on any DisplayPort port but HDMI works, the issue is likely isolated to the monitor’s DP input, the cable, GPU DP hardware, or compatibility firmware.
If neither DisplayPort nor HDMI produces an image and the PC does not complete startup, inspect GPU power, RAM seating, motherboard diagnostic LEDs, and beep codes. A VGA debug LED can indicate a graphics initialization problem, while a BOOT LED may mean the PC is running but not reaching the operating system. At that point, test the GPU in another system or test a known-working GPU in yours. Seek repair or warranty service when the monitor fails with multiple sources, or when the GPU’s DisplayPort outputs fail across multiple monitors and cables.
FAQ
Why does my DisplayPort monitor say no signal but HDMI works?
HDMI working proves the PC and monitor can display an image, but it does not prove the DisplayPort path is healthy. Test another DP cable and GPU port, manually select DisplayPort on the monitor, lower the refresh rate to 60 Hz, and reinstall the graphics driver if the issue begins only after Windows loads.
Can a bad DisplayPort cable cause intermittent black screens?
Yes. A marginal cable may work on the desktop but fail during high-refresh gaming, HDR activation, sleep wake-up, or resolution changes. Replace it with a properly rated cable rather than relying on an extension, coupler, or adapter.
Why does DisplayPort lose signal after sleep?
The monitor and GPU can fail to complete their wake handshake. Disable the monitor’s deep-sleep or power-saving mode if its menu provides one, update the GPU driver, and use the full power-reset procedure. In Windows, also test Settings > System > Power & battery > Screen and sleep with longer sleep timers.
Should I use DisplayPort 1.2 or 1.4 mode?
Use the highest mode supported by both the GPU and monitor for high resolution or high refresh rates. Use DP 1.2 temporarily when troubleshooting an older GPU, monitor, dock, or KVM. If DP 1.2 restores the picture, the issue is likely bandwidth, cable quality, or device compatibility rather than a completely dead port.
