I have just connected my Nexus 4 to my laptop with a USB cable to enable me to transfer photos from the phone to my laptop. When I have done this before it has been a straightforward process but now the phone does not show up as a connected device so I cannot open it to transfer the photos. Does anyone have any advice how I can resolve this problem as I am most frustrated at not being able to transfer my photos in any way as the bluetooth does not appear to be working on my laptop either.