How to Fix the Brightness Keys Not Working on HP EliteBook 840 G3?

Are you having trouble adjusting the brightness of your HP EliteBook 840 G3 laptop? If so, you’re not alone. Many users have reported that the brightness keys on their laptops are not working properly.

Fortunately, there are several troubleshooting steps you can take to get your brightness keys back up and running again.

In this article, we will discuss how to fix the brightness keys not working on HP EliteBook 840 G3 laptops. We will walk through some simple solutions as well as more advanced ones if needed. With a little patience and perseverance, we’re sure that you’ll be able to get your laptop back in top form soon!

How to Fix the Brightness Keys Not Working on HP EliteBook 840 G3?

The function keys are not working properly on HP EliteBook 840 G3 laptops. This can be caused by a number of reasons, such as outdated drivers or incorrect settings.

You can try the following step-by-step solutions one by one and see which one works for you.

1- Check if the Keys are Working

The first step should be to check if the brightness keys are working.

To check if the brightness keys on your HP EliteBook 840 G3 are working, you can easily use a website like Key-Test. This website allows you to test your keyboard and make sure that all keys are functioning properly.

hp elitebook 840 g3 keybaord

To begin, open the website. Then, press the brightness up and down keys on your keyboard, both with and without the “Fn” key. The website will show you if the keys are being registered correctly or not.

If the website confirms that the keys are working, then you can go to the next step.

Updating your drivers and checking your keyboard settings are two common solutions. However, if those don’t work, you may need to consider more advanced troubleshooting steps.

2- Update Drivers

Updating your drivers and software responsible for handling keyboard hotkeys and display brightness might help. To do it, go to HP Softwares and Drivers Download page, select your model and OS, then download the drivers especially display drivers.

An easy alternative solution is to use a reliable software like Driver Booster. This software is designed to scan your computer for outdated drivers and automatically update them, saving you time and effort.

Using outdated drivers can not only cause issues with the functionality of your computer, but it can also pose security risks. By keeping your drivers up-to-date, you can ensure that your computer is running smoothly and safely.

3- Download HP Hotkey Support

In addition to updating your drivers and software, there is another crucial step that could help resolve the issue with your HP EliteBook 840 G3’s brightness keys. Download the HP Hotkey Support software as well. This software specifically handles the hotkeys on your laptop, which includes the brightness keys.

Without this software, your laptop may struggle to recognize and register the keystrokes made on these hotkeys, causing them to malfunction or not work at all. This is a common issue that many HP EliteBook users encounter, and fortunately, downloading and installing the HP Hotkey Support software can easily fix the problem.

Furthermore, the HP Hotkey Support software does not only handle the brightness keys but also other important hotkeys on your laptop, such as the volume keys and the mute button. Having this software installed on your device ensures that all your hotkeys are functioning as they should, saving you from the frustration of having to deal with any malfunctions.

4- Reinstalling Windows OS

If none of the above solutions worked, you might have to consider reinstalling the Windows OS on your HP EliteBook 840 G3 laptop. Reinstalling Windows can be a tedious and time-consuming process, but it is still an effective way to fix any software issues with your device.

Before doing that, make sure you have a backup of all your important files and documents. Once you are ready, start by formatting your laptop’s hard drive and then reinstall the Windows OS using an official copy or a USB drive.

It may take some time to finish, but once it is done, the brightness keys on your HP EliteBook 840 G3 should be working normally again. If the issue persists, it is recommended to seek assistance from a professional.


Overall, troubleshooting the brightness keys not working on HP EliteBook 840 G3 laptops requires a combination of patience, perseverance, and technical knowledge. By following the steps outlined in this article and utilizing tools like Driver Booster, you can quickly and easily resolve this frustrating issue and get back to using your laptop with ease.

It’s important to address any issues with your brightness keys as soon as possible. Being able to adjust your brightness is a crucial component of using your laptop, and you don’t want to be stuck with a dim or overly bright screen. By following the steps outlined in this article, you can hopefully get your keys back up and running in no time.

However, if none of those solutions work for you then seeking professional assistance would be recommended in order to get your laptop running smoothly again.

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Mian Hassnain

Mian Hassnain is a technology enthusiast with a passion for all things tech. With a keen eye for the latest advancements in the field, Mian is always on the lookout for new ways to leverage technology for the benefit of society.

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