I have tried this on multiple machines - my Nexus 7 doesn't actually mount in Windows no matter what I try. The USB cable works as I can see that the device is still charging - I've tried this with multiple USB cables on different computers and the problem persists (which would assume the problem is down to this tablet).
When I place the USB cable into the device it charges but I cannot see a removable drive appear in 'My Computer'
This ** definitely** worked before as I have already transferred a number of files to the device - anyone got any ideas of how to fix this?
I am using the stock ROM from Google and is not rooted, MTP is checked in the USB computer connection.