Hello Monu1994. Thank you for posting on the HP Forums.
I understand the computer is not starting up properly. To commence troubleshooting, please apply the steps in this HP document: http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c01443371
If the issue is not resolved, the next step is testing the computer hardware. For more assistance on how to do this, please run the diagnostic tests, as suggested in this HP document: http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c01443317
Please note that the above documents are intended for select operating systems. However, the troubleshooting steps are relevant for all recent versions of Windows.
Provide your results once you complete the troubleshooting. I'm only here to help!
Mario