Hi @sujit72617
What colour is the Caps Lock button and how many times does it blink?
Usually it is not a continuous blink but a pattern of blinks that are repeated after a small pause between each set.
The blinks are an error code that tells you what's wrong.
Here's a [https://support.hp.com/us-en/document/ish_1997719-1528356-16|link] that will help you to find out what the problem may be.
Click on the ''Identify the Notebook Light or Beep code'' link on the page.
Here's the [http://h10032.www1.hp.com/ctg/Manual/c05922740.pdf|hardware maintenance manual] for the laptop that will help if you need to open the laptop and check/replace any components.