My 5577 had no sound it. My speaker says “No Audio Output Device is installed”. Before this happened I was playing games online with my friends and suddenly the sound coming from my headphones became crackled and distorted before disappearing completely. I’ve tried everything, uninstalling and reinstalling the Realtek High Audio Definition drivers but it still wouldn’t work. I’ve even tried factory resetting and the audio came back but then disappeared again a day later. I saw someone on reddit with the same problem but no one ever helped him so I came here.