Keys not working on keyboard

Hi all,
Keyboard randomly stopped working overnight:CAPS lock, n and b keys won't work but are not stuck. Sometimes a u will appear instead of n. Typing via OSK. Computer had been working fine although it was giving me weird messages yesterday about the wrong charger when I plugged in, when it was the same charger it's always been (that came with the product July 2014).
Regards,
ikki

Dear Customer,
Welcome and Thank you for posting your query on HP Support Forum
It looks like you are having issues with the Keyboard on your Notebook.
We will surely assist you with this.
Let’s start with a questions:
1. Was there any liquid split on the Notebook Keyboard
2. Is there any Dust settled on the Notebook Keyboard
3. Are there any Keys which are fallen off / Any Keys which are loose
Troubleshooting: 
Step 01. Click on the Start Button and go to Control Panel
Step 02. Open the Device Manager and expand the Keyboard from the list
Step 03. Right click on Standard PS/2 Keyboard and click on Uninstall
Note: This driver will get installed again automatically on your Notebook
Step 04. Please turn OFF the Notebook
Step 05. Un-plug the Power/AC Adapter and also remove the Battery too
Step 06. Press and Hold the Power Button of the Notebook for a full minute
Step 07. Now let's re-insert the battery back in and plug back the Power/AC Adapter
Step 08. Start the Notebook and keep tapping F10 Key during the startup to access the BIOS
Step 09. Once you get to the BIOS, Please press F9 or F5 Key[Model specific] to load setup defaults for the BIOS
Step 10. Use the arrow keys to say "YES" and hit enter
Step 11. Now let's press Esc/Escape Key. Save Changes and Exit - Yes
Step 11. Now please wait till the Unit loads the Windows Operating system
If the issue still persists please check and verify if an External Keyboard works fine with your Notebook
Note: Please click on the below shown link to find more troubleshooting steps
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c03738933&tmp_task=solveCategory&cc=us&dlc=en&lc...
Hope this helps, for any further queries reply to the post and feel free to join us again
 **Click the White Thumbs Up Button on the right to say Thanks**
Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.
Thank You,
GBL84
Although I am an HP employee, I am speaking for myself and not for HP

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