I have got the solution.
Issue: I tried to hibernate the laptop when it was on very low battery. As a result, it shut down in the middle of hibernation. When I tried to start it up again, it tried to read from a corrupt hibernation file and hanged on "HP Invent" page.
Resolution: Removed the battery, removed both the RAMs and keep the laptop for 30 min. After 30 min, I attached the battery and one of the RAM. It started with an error message. Then I shut it down properly, attached another RAM and started it. Everything came back to normal.