@krilaurya
Welcome to HP Community
I have gone through your Post and I understand your concerns
Do you have lights anywhere on the AIO desktop?
Have you tried different wall outlet to ensure it's not an outlet issue>? Have you tried different power cord?
If the issue persists please contact HP Support for Service Options
Click on this link - www.hp.com/contacthp/ and select your Country to get the Contact details for HP Support
Thank you
If the information I've provided was helpful, give us some reinforcement by clicking the "Solution Accepted" on this Post and it will also help other community members with similar issue.
KrazyToad
I Am An HP Employee