@keerthi_priya
I don't know what you expect us to do from here -- as we have no way of examining or troubleshooting your PC.
IF the troubleshooting fails, that implies that your keyboard and/or the underlying membrane have gone bad and in that case, they would need to be replaced.
Sorry, but this is just a self-help forum staffed mostly by volunteers and we are neither able, nor permitted, to provide any repair estimates or equipment prices.
For this information, you would need to contact an HP Repair or Service Center.
If you live in the U.S., here is a link to the HP Service Repair Centers:
https://www.service-center-locator.com/hp-hewlett-packard/hp-hewlett-packard-service-center.htm
If you live outside the U.S., here is a link to HP Service Centers, by Country/Region: https://support.hp.com/in-en/service-center
Good Luck
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