I have tried 6 different USB cables. 4 are supposed to be sync cables, 2 are MHL cables which charge only. The sync cables make the computer connection sound but don't show up on the computer. I have tried Smart Switch and Kies but phone still won't connect. They all charge the phone OK. I used to have an S3 that connected to Win 7 OK.
I looked into buying a genuine data cable but see a lot of claims which aren't backed up by feedback. Does anyone know where I can get a genuine cable from?
I looked at Device Manager and saw an unknown device with a yellow triangle and black exclamation mark. I have tried uninstalling and reinstalling.
I have spent many hours on this, just to download 4 pictures. Can someone please suggest what to try next?
Tried WiFi. Only Router appears.
Tried WiFi Direct. Nothing Appears
After many hours, tried:
I saw 'Unknown USB Device (Device Descriptor Request Failed)'
Driver Error (in grey)
I clicked 'Remove Device' and clicked 'Yes' to the message 'Are you sure that you want to remove this device'
Re-inserted USB cable and suddenly my phone appeared on computer. I downloaded my pictures and tried it again.
Every time, since then. I get the error 'Unknown USB Device (Device Descriptor Request Failed)' and my phone won't connect.