Hello saalomi,
Welcome to the HP Forums! I hope you enjoy your experience!
I understand you were troubleshooting hard drive issues, and now you do not hear any sound when you play videos. I apologize for the delayed response, but I will do my best to assist you! In order to assist you properly, I do require a little more elaboration on the issue, and the following information:
1. The computer's model number. If you require assistance locating this information, please reference this website: Locating the Model Number of the Computer
2. The computer's operating system. If you require assistance locating this information, please reference this website to determine your Windows operating system.
3. Have you installed any new hardware on this computer, before the issue appeared?
4. Have you installed any new software or drivers on this computer, before the issue appeared?
Please respond as soon as possible. Thanks for choosing the HP Forums. Have a great day!
Mario