Not sure if any one can help? I bought a cheap 7 inch tablet and connected it to my pc via the usb cable and transfer box thinking i could load APK files i had downloaded. The tablet was not recognised. I am now in the position that the tablet will only boot if connected to a pc via the usb port. It doesn't seem to matter whether its windows or ubuntu. The tablet does seem to charge once booted and connected to the charger, but if i unplug the usb cable it switches off and if i close down and disconnect it will not restart until i reconnect the usb.