i have lenovo y50-70,suddenly all port usb stop working for example if i put usb in port 3.0 or 2.0 i can't access them and they don't appear in my computer just in device manager with yellow mark and i'm running win 8.1 64 bit"
if someone know to find driver for usb i didn't find it in lenovo web site
I tried this it still the same no yellow mark in device manager it should be the registry key in regedit
You could try Fix it CLICK HERE from Microsoft.
I had a similar problem gave up searching for a solution and just reinstalled windows.
1]: [click here
Ok thx brynit
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