Troubleshoot a Monitor That Will Not Turn On

Introduction

If your monitor is not turning on or shows no signal after setting up your new CLX PC, this guide will help you identify the most common causes and work through the basic troubleshooting steps.

In many cases, the issue is related to monitor power, the video cable, the selected input source, or the video output being used on the computer.

Issue description

This issue occurs when the computer appears to power on, but the monitor remains blank, shows a No Signal message, or does not appear to receive power.

The cause may be the monitor, power connection, video cable, selected input, graphics card, or video output connection.

Signs

• The monitor does not turn on or show a power indicator
• The monitor displays No Signal or a similar message
• The computer appears to turn on, but nothing appears on the screen
• The monitor works with another device but not with the new CLX PC
• The monitor's power light is off or behaving unexpectedly

Basic troubleshooting steps

Start with these checks before making any changes to the computer.

1. Confirm that the monitor's power cable is securely connected to both the monitor and a working power outlet.
2. Make sure the monitor is powered on and check for a power indicator light.
3. Confirm that the video cable is securely connected to both the monitor and the computer.
4. Make sure the monitor is set to the correct input source, such as HDMI or DisplayPort.
5. If your PC has a dedicated graphics card, make sure the monitor cable is connected to the graphics card and not the motherboard's video output.
6. Try a different video cable or another available video output on the graphics card.
7. If possible, test the monitor with another device or test the PC with a known-working monitor.
8. Restart the PC after confirming all power and video connections.

Advanced troubleshooting steps

Step 1: Test the monitor with another device

Connect the monitor to another compatible computer, laptop, game console, or other device.

• If the monitor works normally, the issue is more likely related to the PC, cable, or video output.
• If the monitor still does not turn on or display an image, the monitor, power connection, or cable may be the cause.

Step 2: Test the PC with another monitor

Connect a known-working monitor to the CLX PC using a compatible video cable.

• If the second monitor displays correctly, the original monitor or cable is likely the cause.
• If the second monitor also shows no signal, continue troubleshooting the PC and its video output.

Step 3: Check the graphics card connection

If your CLX PC has a dedicated graphics card, make sure the monitor is connected directly to one of the graphics card's video outputs.

Do not connect the monitor to the motherboard's video outputs unless your system's configuration specifically requires it.

Also confirm that the graphics card is installed correctly and that its required power connections are secure. If you are not comfortable checking internal hardware, contact CLX Support for assistance.

Step 4: Check for display output from another port

If your graphics card has multiple HDMI or DisplayPort outputs, try another available output.

If the PC has more than one type of video output, you can also try a different connection type if you have the appropriate cable available.

Step 5: Check for hardware or configuration issues

If the PC still does not display an image, the issue may be related to the graphics card, motherboard, memory, or another hardware component.

At this point, avoid making additional BIOS or hardware changes unless instructed by CLX Support. Support may recommend additional diagnostic steps based on your specific system configuration.

Diagnostic tools and resources

The following can help isolate the cause:

• A known-working monitor
• A spare compatible HDMI or DisplayPort cable
• Another available video output on the graphics card
• Your CLX system documentation
• Your monitor's documentation
• CLX Support for additional hardware diagnostics

Contact support

If you have completed the steps above and your monitor still does not display an image, contact CLX Support for further assistance.

Be prepared to provide your system model, monitor model, cable type, and the troubleshooting steps you have already completed. If possible, also let Support know whether the monitor works with another device and whether a different monitor works with your CLX PC.

Additional resources

For additional help, review your monitor manufacturer's setup guide and your CLX support articles related to GPU installation, display output, and first-time PC setup.

Conclusion

A monitor that does not turn on or shows no signal after PC setup is often caused by a power connection, incorrect input source, video cable, or incorrect video output.

Testing the monitor with another device or the PC with another monitor can quickly help determine whether the issue is with the display or the computer. If the problem continues, CLX Support can help with further diagnostics.

Disclaimer

Troubleshooting steps may vary depending on your specific hardware and monitor configuration. Use caution when handling internal components. If you are unsure about a step, contact CLX Support before making changes to the internal hardware or BIOS settings.