If the HP Elitebook 840 G3 brightness keys are not working, there are a few possible solutions.
Install Hotkey Software (Best Method)
If your HP Elitebook 840 G3 brightness keys are not working, installing hotkey software may be the best solution.
Hotkey software allows you to customize keyboard shortcuts for various actions.
This can be very helpful if you often need to adjust your screen brightness.
By default, most laptops include hotkeys for controlling the brightness and volume of the computer, as well as other functions.
If you have difficulty accessing or using your HP Elitebook 840 G3 laptop’s brightness keys, then installing Hotkey Software may be your best option.
To install hotkey software, first, download it from the internet.
Then, open the file and follow the on-screen instructions.
Once the installation is complete, restart your computer.
After your computer has restarted, open the hotkey software and start customizing your keyboard shortcuts.
Install Latest Graphics Drivers
If your laptop’s graphics are not working or you are having other problems with it, you may need to install the latest graphics drivers.
You can find these drivers on the HP Elitebook 840 G3 website or on the computer manufacturer’s website.
Make sure that you download the correct driver for your computer model and operating system.
After you have completed the installation process, restart your computer. After your computer has restarted, check to see if the brightness keys are working properly.
If they are not, then you may need to update your graphics drivers.
Check Power Options If They Are Affecting Brightness
If the brightness keys on your HP Elitebook 840 G3 laptop are not working, you may need to check the power options in your computer settings.
You can do this by going to Control Panel > System and Security > Power Options.
If the brightness keys are not working because the power options are affecting them, you will need to turn off the power options or adjust them so that they don’t affect brightness.
And make sure that the power plan is set to Balanced or High Performance.
If it’s set to Power Saver or another option, your screen will be dimmer.
If you’re still having trouble, try adjusting the brightness level in the Windows display settings.
Go to Start > Settings > System > Display, and use the slider to adjust the brightness.
If that doesn’t work, try calibrating your display.
Go to Start > Settings > Devices > Display & Brightness > Calibrate Display Color. Follow the on-screen instructions to complete the calibration.
Reset Your BIOS Settings
If the brightness keys on your HP Elitebook 840 G3 laptop are not working, you may need to reset your BIOS settings.
This will get your computer back to the factory default settings and may fix the brightness keys problem.
To do this, go into BIOS (press F2 during startup) and find the “Reset BIOS” option.
Select it and follow the prompts to reset your BIOS settings to their default values.
BIOS stands for Basic Input/Output System.
It’s the first program that runs when you start your computer, and it can be used to configure some basic parameters of your HP Elitebook 840 G3 laptop.
Try Replacing HP Elitebook 840 G3 Laptop’s Battery
If your HP Elitebook 840 G3 laptop’s brightness keys aren’t working, you may be able to fix the issue by replacing the battery.
If the battery is old or damaged, it may not be providing enough power to the laptop, which can cause the brightness keys to stop working.
Replacing the battery is a relatively easy process and should only take a few minutes.
First, shut down your laptop and unplug it from any power source.
Next, remove the back panel of your laptop so you can access the battery. Once you have located the battery, disconnect it from the motherboard.
You may need to use a small screwdriver to loosen a retaining clip or two. With the battery disconnected, you can now remove it from your laptop.
To install the new battery, simply reverse these steps.
If you have tried all of the above and your brightness keys are still not working it is likely that there is a hardware fault with your HP Elitebook 840 G3 laptop.
This could be a broken keyboard cable, or some other issue with the actual keyboard itself.
If your keyboard is not working, the brightness keys on your laptop may not work either.
Check to see if any of the keys are sticking or if there is any debris between the key and the keyboard.
If there is debris or a stuck key, you will need to replace the entire keyboard.
What Are The Causes Of HP Elitebook 840 G3 Brightness Keys Not Working?
There are a few different things that could be causing your HP Elitebook 840 G3 laptop’s brightness keys to stop working.
Outdated Graphics Software
The most common reason is a driver issue.
Drivers are the software that allows your computer to communicate with its hardware, and they can sometimes become outdated or corrupted.
This can cause all sorts of problems, including making your brightness keys stop working.
If you suspect that a driver issue is to blame for your HP Elitebook 840 G3 brightness keys not working, the first thing you should do is update your drivers.
You can usually do this through your computer’s “Device Manager” tool.
Power Saver Mode
Another possibility is that your computer’s power settings are set to “Power saver” mode, which can dim the screen to conserve battery power.
To fix this, go to Control Panel > Hardware and Sound > Power Options and change your power plan to “High Performance.”
If you’re using an external monitor, it’s possible that the brightness keys are affecting that display instead of your laptop’s screen.
To fix this, open the Brightness and Contrast dialog box (right-click on the desktop and choose Adjust screen brightness), then disable the “When plugged in, use power from AC adapter” option.