Hello surya94,
Welcome to the HP Forums!
I understand there is no sound coming from your computer anymore. I can do my best to assist you. Please try all of the steps in this document to re-enable sound on your computer: No Sound from Speakers (Windows 8)
Please let me know what happens after these steps are completed. If there is still no sound, try connecting a pair of headphones or external speakers and see if sound will come out from those. Thanks!
Mario