Computer Monitor Says No Signal

It sounds simple enough to turn your PC on and plug it in. But it’s not always that simple. Even if your computer’s fans are running, you can’t use it if you can’t see anything on the screen. You might be left perplexed by a no signal error on a monitor.

Thankfully, this kind of issue is typically simple to fix. If some of the simpler fixes are unsuccessful, a hardware issue will likely need to be investigated for possible repair or replacement. Here are some display troubleshooting techniques you can use if your computer monitor says no signal.

Why Is My Computer Monitor Says No Signal?

When a connected device doesn’t send a signal while your monitor is on, the no signal error manifests.

This problem can be caused by various factors, some of which are more serious (and expensive) than others. A few of these are:–

  • defective or slack cables
  • display that is improperly set up
  • inadequate drivers
  • Hardware issue with a bad monitor

Troubleshooting Steps For Computer Turns On But Monitor Says No Signal

Try fixing a monitor signal problem before starting your search for a new monitor. If your computer monitor is acting up, don’t give up because most of them can be fixed.

Occasionally, the monitor turns on, but the images on the screen are strange, have intense colours, or are splotchy. When you turn on your computer, if this is what you see, there is probably a problem with the monitor cables or the way the cables are attached to the monitor or computer ports.

Follow the below-mentioned steps to troubleshoot this error –

Step 1: Pay Attention To The Lights And Listen As You Turn On The Computer

Start by turning on your computer. The power button should turn on the LED power lights simultaneously if your monitor is connected to your computer. You might need to use a remote control or press the power button on the monitor if it is plugged into a different power source. Check your monitor’s input and connect it to the input where your PC is connected if the monitor turns on, but you still can’t see your startup screen.

If the issue continues, keep an eye on the LED lights on the CPU tower, keyboard, and mouse, as well as listen for system activity. The monitor might not be responding if you can hear the fans humming and feel the air blowing from them while watching the LEDs flash successively.

Step 2: Check Your Cables

Take a close look at your monitor cables before trying anything else. One of the most frequent causes of a monitor reporting no signal is an erroneous, loose, or improperly placed cable.

Checking your DVI, HDMI, or DisplayPort cables correctly involves the steps listed below:

Replug each cable after it has been unplugged. Ensure that each cable is securely connected

It may seem obvious, but you should also confirm that each cable is positioned properly.

Next, look for any cable damage. Look out for nicks, bends, and fraying. Rub your finger along each cable as well because some problems are difficult to see. This will help you find less obvious issues.

Take a look at the cable ports. The connection may be hampered by port clogging dust and debris.

Switch to a different monitor and test each cable there. Ask a friend if you can use their extra monitor if you don’t have one yourself.

It’s likely that the cable is to blame for the no signal problem if it doesn’t function with the new monitor. An additional cable must be purchased.

Continue with the next potential solution if all of your cables appear to be in good working order.

Step 3: Check Monitor Input Source

Numerous monitors have multiple input sources because versatility is crucial in today’s market. There will undoubtedly be a signal issue if your monitor is configured with the incorrect input source.

The display menu settings allow you to check and modify the input source for the monitor.

Look for the Input Source setting by simply opening the display menu. A physical button may also be found on the side of some monitors. You can navigate between the various selections by pressing this button.

Decide which input source to use for your monitor. As an illustration, you would select HDMI as the input source if your monitor is connected to your device via an HDMI cable.

Step 4: Examine the Screen Changes

A malfunctioning computer monitor may occasionally still be functional despite its problematic screen. You’ll see dim lights, or the monitor’s display might be dimly visible. This is the issue with old CRT monitors, and it indicates that you should upgrade your current display.

If a more recent monitor exhibits this issue, there might be a problem with the monitor cable or the video cards and ports on your computer. This issue in VGA cables may be brought on by faulty or missing pins. Examine the cables and replace any damaged ones as soon as possible.

Step 5: Check the Display Adapters

Wires and computer monitor adapters may become loose if you move or alter your setup. Any loose wires will affect signals from the CPU to the monitor, but won’t affect the monitor itself. Take a flashlight and a look behind your computer after turning it off. The computer monitor cables and display adapters should be located, then reseated.

Resetting the connection entails removing and then re-adding it after a brief delay. To check the pins, holes, or jack before reinstalling the connection, use your flashlight. Examine the wires for cuts or other issues and look for missing pins or corroded or decaying ports. The cable should be changed for a new one if you notice any issues. If there’s a port issue, connect your monitor to a different, readily available port.

Step 6: Fix Loose Internal Computer Components

There’s a chance that one or more of the video components may have come loose if you have opened or changed any of your computer’s components. To access the CPU case, turn off your computer. Examine the video ports, wire connectors, and video graphics cards using a flashlight. You should fix any loose parts as soon as possible.

If you are not sure, take your PC to an expert. Has it been identified and fixed? Keep in mind to use only genuine parts when replacing or upgrading components.

Step 7: Reset BIOS to Default Configuration

Resetting your computer’s BIOS is the last resort. Your system will be reset as a result.

  • Press F9 to reveal the Load Default Options when you are in your PC’s BIOS.
  • Select Yes if you want to restore the BIOS to its default settings.

Removing the motherboard’s CMOS battery is a different method of performing a BIOS reset. Similar to a watch battery, the CMOS battery is flat and coin-shaped. With the power cord disconnected from the outlet, your PC should be turned off. Identify the CMOS, then take it out. 10 minutes later, put it back in. The BIOS can rest on this alone.

Step 8: Examine the Hardware

Your computer may be experiencing some hardware problems if all the steps and tricks you’ve tried to fix it have failed and it still powers on without a display. Additionally, it might be time to get a new video graphics card or have your PC serviced by a pro.

A new monitor, new video card components, or an upgrade to your motherboard are all options. Take your monitor to a repair facility only if you are certain that there is nothing wrong with your system. Take it in for repairs if your monitor is still covered by warranty after checking. We advise getting a new monitor in place of the old one if it is.

Step 9: Check Resolution Configuration

It’s worth determining if the resolution configuration is problematic before turning on your computer. There will almost certainly be a no signal issue if the resolution on your graphic card is set higher than what your monitor can handle.

You can try starting your computer in safe mode to change the resolution to one your monitor can handle. It boots your PC by default at a low resolution. The following technique can then be used to change the display settings as desired:

Open the Windows Settings menu

Go to Systems

Then go to Display and look for Display Resolution.

Now, change to the desired resolution.

Following that, a pop-up window will ask if you want to maintain these display settings.

At this point, click on Keep changes.

Step 10: Upgrade Graphics Card Drivers

The problem might lie with the monitor. The graphics card, however, is to blame for the majority of display problems. A new graphics card driver is probably to blame for your blank screen.

Some resolutions might not be compatible with your display. Your display might also help you with solutions that your graphics card cannot support right now. This is especially true if your display is capable of 4K or 240Hz.

If your graphics card is still fairly new, you might be able to solve the problem by simply updating the drivers.

The best way to access bug fixes and new features are to update drivers frequently.

New monitors and screen resolutions are supported as well.

If you have the NVIDIA graphics card, you can use Windows Update to update your NVIDIA drivers.

Now, verify that the No Signal On Monitor problem has been resolved.


The no signal message signifies that your PC is experiencing a “No Signal On Monitor” problem. You can fix this issue with the solutions we have mentioned in this post. The RAM or graphics card is typically the problem. Check them first, then move on to the next step to determine which approach is best for you.

However, if you are unable to solve the issue, we recommend you to consult with an expert.

Experiencing difficulties with your Device, check out our “How To” page on how to resolve some of these issues.


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