Hello! I am new but I find this community to be very informative and friendly so I decided to give it a go. I tried several other forums they all fail to find a solution to my problem. First off let me fill you in on what the situation is. I bought a new HDD for my laptop because the last one got corrupted and I had to change it. So I got the new one. It was completely fresh out of the shop so I went and installed windows 7 ultimate x64 and everything was great until my sound mysteriously dissappeared. I didn't panic and I went and installed some proper drivers like I always do when this happens. I got them from my laptop's brand site and it was the exact match for my sound device, so I am 100% sure my drivers are correct. And it fixed it for like 20 minutes and then it went off again. I restarted the laptop - sound got back. 20-30 minutes later boom no sound again. A restart fixed and so on and so on. Basicly a restart fixes it but it is unbearable to have to restart your laptop every 20 minutes. I tried restarting the audio service from the "services.msc" that worked too for like 20 minutes and with every next restart it worked less and less efficient when it got to the point that when I restart the service the audio dissappears again in a few seconds. So far I tried basicly anything and nothing worked. The thing that bothers me is that a restart/service restart fixes it. Why is that? That makes me think it is not a hardware problem and it is something to do with the software. Oh yeah and I considered the OS to be a corrupted install. But it's not. I tried putting on a new one and it's the same thing. And the audio ports are fine too. The default sound device is correct too and I even see the green bar going up and down when playing music but I just don't hear any sound. That's it I think but I may be leaving some other method I tried out so please tell me your opinions. Thank you in advance and have a nice day! P.S. System restore does not work since this started from the very first log in the OS. There is nothing I can restore back to. And even if I did it would stop 30 minutes after that so..