Just after installing windows 8.1 on HP Envy 700-074 bunch of new problem started appearing one by one. I started getting issue with the audio first. There is no sound in the system. I am not able to figure out the reason behind this because I had just ran a 8.1 update. I was already having Windows 8 before in the pc. Just recently a friend updated that on this laptop and it is working quiet well on it.
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