How do I reset my HP laptop?

[jaykinoti]

My relatively new HP Probook 450 G4 has an unremovable battery. It has a black screen and flashes the caps lock LED twice slow and twice fast. I have tried the reset procedure guided by HP agent but does not work yet. Any other way out?

 

[hang-the-9]

Match the blink codes here to what your system does https://h30434.www3.hp.com/t5/Notebook-Boot-and-Lockup/HP-Laptop-Error-Blink-Codes/td-p/6142972