Keyboard is malfunctioning

[Bilal211]

i tried switching fully to cachyos but then mid install cachyos installation failed due to network issues so i restarted the installation with better network but then noticed keys u, i, o, p, j, 1, 2, 3,8,9,0 etc stopped working even in bios not all keys on keyboard stopped please help, i resinstalled windows keys u, i, o, p are back but 1,2,3,8,9,0,f and j are not working help pls, it's a hp elitebook 840 g3 

[MysteriousMe]

Welcome to HP Support Community, @Bilal211 

Thank you for posting your query, I will be glad to help you.

Sorry to hear you’re facing this issue. Since the problem persists even inside the BIOS,

Steps you can try:

Power reset

Shut down completely

Disconnect charger

Press & hold power button for 20 seconds

Reconnect charger and boot → Test keys

Check keyboard connector (if you’re comfortable opening the laptop)

Remove bottom cover

Locate keyboard ribbon cable and ensure it is properly locked & aligned

Reassemble and test keys again

Test with an external USB keyboard

If all keys work externally, the internal keyboard itself is defective

I request you to reinstall the operating system on my HP EliteBook 840 G3 using the USB bootable device method.

Requirement:

• Install the OS by booting from a bootable USB drive, following the standard procedure using tools like Rufus or any approved imaging utility
• Configure the system to boot from USB in BIOS/UEFI and proceed with the OS installation

You may prepare the USB using:

A USB flash drive of at least USB 8 GB or higher

I hope this helps.

Take care and have a good day.