I am using HP DC7100 with Windows Xp. Suddenly it has started giving me problems. HP DC7100 is having internal speaker which was working properly earlier but now I am not getting sound from it. Its not working even after disconnecting my external speaker. If have also open sound setting from the control panel in my system but I didnít find anything related to it. I have installed all the windows updates and then restarted my system but it didnít help me to solve this problem.