Why does my monitor go to sleep immediately?

The monitor detects no incoming data from the PC. It enters standby mode to save power.

Does it matter if I use HDMI or DisplayPort?

Functionally no, for basic troubleshooting. But ensure you select the correct input source on the monitor.

Fix No Signal Message on Computer Monitor

Before you begin

Match the environmentUse this guide only for Windows 10, Windows 11 or a clearly compatible setup.

Protect recoveryBack up important data and save encryption or account recovery keys before changing system state.

Know when to stopMake one change at a time and stop if the result differs from what the guide describes.

Problem overview

You power on your PC and monitor, but the screen displays a “No Signal” message before going black. The monitor is receiving power, but it is not receiving any video output from the computer.

Common causes

Cable plugged into the motherboard instead of the dedicated GPU
Loose or damaged display cables
Monitor input set to the wrong source
GPU seating or power issues

Solution 1: Check cable routing and seating

Inspect the back of your PC case. Ensure your display cable is plugged into the horizontal ports of the dedicated graphics card (further down), NOT the vertical ports on the motherboard.
Unplug the cable from both the PC and the monitor, then firmly reconnect them.
If the problem persists, test a different display cable to rule out a broken wire.

Expert Tip

Use the physical buttons on your monitor to open the On-Screen Display (OSD). Manually set the input source (e.g., HDMI 1, DisplayPort) instead of relying on the Auto-Detect feature.

Solution 2: Reseat the Graphics Card

Turn off the computer and switch off the power supply.
Open the side panel of the PC case.
Unplug the PCIe power cables from the graphics card.
Unscrew the retention bracket, press the PCIe release tab on the motherboard, and remove the GPU.
Firmly reinsert the GPU until the tab clicks, reinstall the screws, and reconnect power.

Solution 3: Test alternate hardware

Connect the PC to a different monitor or a television using the same cable.
If the TV displays an image, the original monitor is likely faulty.
If neither displays an image, try connecting the monitor to a completely different device (like a laptop or game console).
If the PC has an integrated GPU, remove the dedicated graphics card entirely and plug the monitor into the motherboard to isolate a dead GPU.

Caution

If the computer continuously restarts or you hear a sequence of beeps, the system is failing to POST, which is a system hardware issue, not just a monitor issue.

Confirm the result

Repeat the exact action that originally triggered the problem.

Confirm the original error or symptom is gone and no new warning has appeared.

If the guide changed a driver, service, package, or system setting, restart once and test again.

If the result is worse or unexpected, stop. Reverse only the last change using its documented restore option; if none is documented, use your backup or qualified support.

Fix No Signal Message on Computer Monitor

Before you begin

Problem overview

Common causes

Solution 1: Check cable routing and seating

Solution 2: Reseat the Graphics Card

Solution 3: Test alternate hardware

Confirm the result

Questions about this fix

Weighted Consensus Protocol

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