AOC Monitor No Signal (7 Quick Fixes!)

Consistency is one of the qualities of the top 10 best-selling AOC Monitor & PC monitors in the world. There are some challenges that come with them. The no signal message is a challenge that many users working from home have encountered.

AOC Monitor No Signal

You can fix the no signal error by turning off the monitor and computer.

It’s best to wait up to 30 seconds. After turning on the monitor, turn on your computer.

All cables should be secure and undamaged, and the correct input and resolution settings should be selected.

That is it, that is it! The quick and easy steps will remove the error message from the vast majority of users.

Don’t panic if you don’t see it. There are a number of steps that can be attempted.

These include fixes for the display as well as steps to fix the PC.

It is a good idea to follow the steps in a sequential order.

Step 1: Power Cycle Devices

Power cycling your devices is the first thing you should attempt if you have spent a lot of time trying to fix electronics.

I don’t like being told to turn my products off and back on again when they aren’t working.

That’s right, but guess what? You wouldn’t think that this fix works as frequently as it does.

The best way to approach this is to turn off the monitor and then shut it down.

Plug the PC into the power supply and then power down.

After about 30 seconds, everything can be plugged back in and you can power up your computer.

Don’t look at this detail because the order of events here really matters.

While this seemingly overly simplistic fix does work for many users, it will not work for everyone.

There is no need to worry if you are still getting the error. Proceed on until you reach the next step.

Step 2: Match Monitor Input To Display Cable

Four of the most common display cables are HDMI, DisplayPort (DP), and VGA.

AOC monitors typically support 2 or 3 of these depending on the model, as it turns out.

Users often set their monitor to an input that does not correspond to the display cable they are using.

You need to have a basic understanding of what each of these cables looks like.

It is possible to use the graphic below for assistance.

You need to identify the source or input button if you feel confident that you know the exact cable you are using.

The source and input buttons are located on the right side of your monitor.

It will either be on the backside of the display or at the bottom.

You can see the following input box on your screen once pressed.

When you identify the input that matches your input cable, use the corresponding keys to switch the input options.

Step 3: Ensure Display Cable Is Secure And Undamaged

A display cable that is not secured can cause a number of issues, from screen flickering, to signal errors, and more.

It is important to check your display cable connections and make sure they are firm on both ends.

If you want to firmly push the cable head into the port, you should plug the cable back in.

Users will only look at the connection in order to assume everything is ok.

There needs to be more than a visual inspection alone.

There is a tiny separation between the laptop and the cable head, but it’s not obvious to the untrained eye.

It was sufficient separation to cause a break in the connection.

Having said that, there is also value in performing a close visual inspection of the cable itself to check for damage.

Try a different display cable if you have done all of this without any results.

If I was using an HDMI cable, I would try to replace it with a DisplayPort.

Changing the input settings is something you need to do again.

If you use a different cable to solve the problem, your original cable is probably junk.

Either buy a new one or stick with the one that was replaced.

Step 4: Test Different Resolution Ranges

AOC monitors have a range of possible display resolutions that they can relay back to your PC, depending on the particular model you have.

If your computer’s graphic card falls out of this resolution range, a ‘no signal’ message can arise.

In fact, it’s even possible that your monitor won’t turn on at all.

To fix this, you need to reboot your computer using Safe Mode. 

When you are in Safe Mode, your PC uses a lower display resolution.

You can use this time to navigate to your computer’s resolution settings and select a lower standard display resolution.

It is easy to do a little bit of resolution setting testing.

Increasing the settings higher and higher until the error returns is the best way to go.

The change can take hold if you wait 15 to 30 seconds between the tests.

Then you just have to set one level below.

The model number found on the back of the device can be used to find the exact maximum resolution.

Step 5: Ensure Display Cable Is Plugged Into Graphic Card

Most desktop PCs have on-board graphics units that have direct connections to the back of the computer.

If you are using a desktop PC, make sure your monitor cable isn’t connected to the computer’s board.

It should be connected to the graphics unit directly.

It is always a good idea to double check because this is an easy mistake to make because the ports are the same.

Step 6: Remove and Reorder RAM

Improper Random Access Memory (RAM) stick connections could also be to blame.

If you want to open your PC unit, ground yourself and remove all the cables.

All of the RAM sticks need to be removed.

If there is no visible damage, blow off any dust or debris and seat them again.

It’s a good idea to place the sticks in a different order that you found them.

Step 7: Remove and Reinsert CMOS Battery

The battery in your laptop or computer powers the computer’sBIOS.

If you don’t know, it’s called CMOS and it stands for Complementary Metal Oxide Semiconductor.

The basic input/output system is known as theBIOS and it manages the essential functions of your computer.

Once again, with your computer off and all the cables unplugged.

Ground yourself and open up your PC unit and change theBIOS back to its previous configurations which can often fix a lot of different issues.

There is a way to remove the battery from the board.

If you want to drain excess power, hold down the power button for 10 seconds.

After restarting your computer, make sure to check to see if your display is functioning.


If you are still having issues after giving each of these fixes a try, you can contact the Customer Service Call Center at the above number.

AOC Monitors have a three-year warranty, which is very generous. If you want to let me know how you did, shoot me a comment!

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