OK, I had the same problem: NOTHING was showing up in the notifications bar... Then I went on the internet wich BTW didn't help at all! That's when I started playing with it.
Just be stubborn... Keep pressing usb debugging while the usb cable is connected. just keep pressing it, don't ask why! And then the you will see notification tab saying usb is now connected use as mass storage device, or somethig like that, BUT DON'T PRESS IT!!! You will have to wait for usb debugging to debug the connection between the SGM and the PC! After about 20 min try to click connect to PC!!! Hope it helps, worked for me!