I am running Windows 8.1 on an HP Envy m4 1115dx. Today the USB 3.0 ports (on the left side) stopped working. I plugged an Ipod into one and it shows on the Ipod that it's charging, but it isn't and Windows doesn't recognize the Ipod. Same goes for my external hard drive. The USB port on the other side works fine.
Thank you for visiting the HP Support Forums and Welcome. I have read your thread on your HP ENVY m4-1115dx Notebook and an audio jack not working. USB 3.0 ports Connect optional USB 3.0 devices and provide enhanced USB power performance. While there are multiple USB ports on the same side, only one USB port will be able to support a high power device at a time. So if you have something USB connected and try to use the 3.0 port it won't work.
Hope this helps.
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