@Harsh1t1023 Welcome to HP Community!
I understand that you are getting a blank display.
Have you tried with an external display?
Please attempt the below step:
Perform a hard reset
As you have stated that you have already performed the BIOS recovery and components test and product under warranty.
I would suggest you contact phone support.
Here is how you can get in touch with phone support.
1)Click on this link - www.hp.com/contacthp/
2)Select the product type.
3)Enter the serial number of your device or select let HP detect your product option.
4)Select the country from the drop-down.
5)You should see the HP phone support number or Chat option listed.
Keep us posted,
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Have a great day!