04-17-2016 04:54 PM
This is my first time here and I really need help with this issue.
I know that the power port for yoga 900 is a combination AC power / USB 2.0 port. When I bought it I can successfully use that port to read flash drives and charge my phone.
Recently it cannot support USB function (cannot read flash drive or charge my phone). I am pretty sure it is not a hardware issue becasue this problem occurred after I adjusted some settings to resolve another problem (the laptop will wake up several minutes after I enter sleep mode). It is likely that some changes I made caused this problem, but I really cannot remember exactly what I did
I tried many options to fix this problem but none of them work. I tried to use device manager and registry (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR) but it didn't help. It seems that the solutions I found online only apply to a standard USB port, not a combination of power and USB port that my Yoga 900 has.
This problem bothers me a lot and I really appreciate it if anyone can offer any kind of help.