Function Keys (fn+F2, fn+F3 and fn+F4) doesn't work

Hello. I have ProBook 4730s and today i cant use my hotkeys for brightness and for external monitor. I need help for this trouble. I already reinstal HP hotkey driver an even graphic control driver but this did not work. Any other solution?
I use this keys normaly few days ago, but today a just cant use it anymore. I can switch to external monitor manualy or pressing (win+P combination key), but i cant manage brifgtness.
Thanks

Hey Akramer,
Are you trying to control the brightness of the external monitor from the HotKeys on the Probook? The HotKeys will only control the brightness on the Probook. It is not capable of control the brightness of the external monitor, the brightness will need to be adjusted directly on the monitor.
If the HotKeys are not adjusting the brightness on the Probook then I would go ahead and hard reset the computer. Here is how you can hard reset the computer:
Shut down the computer by going to the Start menu and selecting shut down. (If you have no display, hold the power button down for 5 seconds)
Disconnect the AC Adapter from the notebook.
Remove the battery from the bottom of the notebook. There will be a switch/button to eject the battery.
Wait at least 1 minute with all power sources disconnected.
Re-insert the battery and reconnect the AC Adapter and then attempt to power on the notebook.
Let me know if the hard reset works.
Thanks,
Sean
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