HP 14-CK0006ni caps lock 3 blink No post

[Caesar_300]

Hello everyone! I bought the HP 14-CK0006ni in 2018 and after 2 years of using it for school, I gave it to my sister. A week later she brought it back to me saying that it giving her a problem & that it used to work at times & other times not,but now it has completely stopped. I checked it and found that it's blinking 3 times and pause a little then 3 blinks again and so on. I opened the laptop and removed the ram module then cleaned it's pins with a microfiber cloth and brushed the ram slot with a clean toothbrush and some benzene, put everything back and got 3 blinks again. I got another HP laptop from a friend which was also using a pc4 ram module dual channel, removed his 8GB RAM and inserted my 4GB RAM and it worked. I tried his in my sister's laptop and it also gave me 3 blinks. I tried power resetting, I disassembled the laptop and removed the motherboard from the casing, cleaned it with benzene reassembled it but still nothing. What can I try next?

[Echo_Lake]

@Caesar_300
Thank you for posting on the HP Support Community.

I appreciate your efforts to try and resolve the issue. This sounds like hardware related issue with the system board, as you've performed relevant troubleshooting steps and the issue persists I would request you to contact our Support and our Support Engineers should be able to sort this out. HP Support can be reached by clicking on the following link:  www.hp.com/contacthp/

Please feel free to contact us here anytime you need any further assistance. Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.