If your monitor says “No DP signal” or “No DP signal from your device,” it is not receiving a usable picture on the selected input. Check the monitor’s power, reseat the DisplayPort cable at both ends, select DP in the monitor’s on-screen menu, and make sure the computer is awake and sending output. If that does not restore the picture, test the cable, port, monitor, and computer one at a time.
What a DisplayPort no-signal message means
The message means the monitor is not receiving a usable video signal through the input it is currently using. Dell’s P2421 user guide, for example, shows the wording “No DP signal from your device.” The message identifies the problem at the display connection; by itself, it does not tell you whether the cause is the monitor input, cable, computer output, or a compatibility setting.
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Start with the checks that are quickest and easiest to reverse. Avoid changing drivers or compatibility settings until the basic connection and input have been verified.
Check power, cable, and selected input
Confirm the monitor and computer are on
Make sure the monitor has power and the computer is running. A sleeping computer may not be sending a signal; wake it with a key press or mouse movement.
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Reseat the DisplayPort cable
Unplug and firmly reconnect the cable at both the monitor and the computer. Inspect it for visible damage. If you have another compatible cable or an available video port, try it to check whether the original cable or port is at fault. Dell recommends swapping the video cable when possible as a way to rule out a faulty connection.
A known-good cable is a useful diagnostic when the existing cable may be damaged or unreliable, but replacing it is not a guaranteed fix for every no-signal problem.
Rank #2
- VESA Certified DP Cable 1.4: This 8K Displayport 1.4 Cable is officially certified by VESA Association; It supports 8K@60Hz, 5K@60Hz, 4K@144Hz, 2K@240Hz and HDCP 2.2/1.4. Display port 1.4 cable is more flexible and slimmer than 30AWG tinned copper, can directly be connected from DisplayPort equipped desktop/laptop to monitor
- Ultimate Gaming Experience: High refresh rates of 4K@144Hz and 2K@165Hz enable crystal-clear enemy tracking with zero frame drops. Dynamic HDR optimizes dark scenes and enhances visual details, delivering tactical advantages in FPS games and immersion in AAA masterpieces
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- Multi-functional Support: The 8K DisplayPort cable supports video resolutions up to 8K@60Hz and transmits HD audio and video from computer to display, ideal for video streaming and gaming. It is also backward compatible with DP 1.3/1.2/1.1
Select DP in the monitor menu
Use the monitor’s physical buttons or joystick to open its on-screen display (OSD), then choose DisplayPort or DP as the active input. A monitor set to HDMI or another source will not display the signal arriving over DisplayPort. Controls and menu names vary by model; consult the monitor’s manual if you cannot find the input selector.
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Wake the computer
If the computer is asleep, wake it and give the monitor a moment to detect the output. If the picture remains absent, check the computer’s display-output setting.
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Enable the external display on a Windows laptop
Press Windows+P and choose Duplicate or Extend. This is a useful check when the laptop is running but its external display output is not enabled. Other computers and operating systems use different display controls.
Isolate the failing part of the connection
Change one part of the setup at a time, so you can tell which test changes the result.
Rank #4
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- SUPPORTS: High bandwidth HBR3, 32.4 Gbps bandwidth, DSC 1.2 display stream compression, FEC forward error correction, and 32 audio channels
- Try a different compatible DisplayPort cable. If the monitor works with the replacement, the original cable is suspect.
- Try another available video output. A picture from another output points attention to the original port or its configuration.
- Connect the monitor to another computer. If it works there, focus next on the original computer’s output, display settings, or hardware-specific driver support.
- Run the monitor’s supported self-test or follow its official diagnostic instructions. If it remains blank across devices, consult the monitor’s model-specific guidance or support channel.
What a monitor self-test can show
Dell describes a basic self-test for supported monitors: disconnect the video cables while leaving the monitor’s power connected. A working display should show a message such as “No Signal,” “No Cable,” or “No DP Cable.” This checks that the monitor can display its own diagnostic message; it does not prove that the computer, cable, or DisplayPort input is functioning correctly. Follow the instructions for your exact model, because available diagnostics differ.
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Check DisplayPort compatibility settings only for the relevant model
Some monitor and graphics-card combinations may require a particular DisplayPort version setting. Dell’s P2423DE guide says that when the connected computer’s GPU supports DisplayPort 1.2, the monitor should be set to DP 1.2 mode; that model is factory-set to DP 1.4. Dell directs users to change the setting in that monitor’s OSD.
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This is a model-specific example, not a universal setting or fix. Check your monitor’s own guide before changing its DisplayPort version; do not assume the same menu option or fallback applies to another display.
When to look at drivers or BIOS
If the monitor, cable, and input checks do not resolve the problem, consult the computer maker’s official support instructions for the exact computer and operating system. Dell recommends checking its driver and BIOS update pathway for some display problems, but a software update is not established as the cause or fix for every no-signal message. Start with the hardware-specific instructions rather than a generic driver utility.
Quick Recap
Use the result of each test to choose the next step
| Test result | What it suggests | Next check |
|---|---|---|
| Selecting DP restores the picture | The monitor had been set to another input. | Leave the monitor on the correct input or select it when changing sources. |
| A different cable or port restores the picture | The original cable or port may be faulty. | Continue using the working connection and inspect the component that failed the test. |
| The monitor works with a second computer | The original computer’s output, display settings, or hardware-specific software may be involved. | Check its display settings and official support guidance. |
| The monitor shows its self-test message but no computer picture | The monitor can display its diagnostic message, but the video path still needs checking. | Recheck the active input, cable, computer output, and model-specific compatibility guidance. |
| No picture appears across tested devices | The monitor or its input may need model-specific diagnosis. | Follow the manufacturer’s diagnostic instructions or contact its support channel. |
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