Touch Tricky connection to PC

Hi everyone.
Back in the days (don't remember the firmware version), connecting my powered off Kobo Touch to the PC will "partially" turn the device on, so that it displays the "Computer Detected" window with the "CONNECT" button.
Several updates ago, the behavior changed. Now if I plug the USB cable when the Kobo is turned off, the device automatically turns on to the "home page", without displaying the "Computer Detected", so I can't connect it to the PC to upload eBooks (or can I connect the it from the menu or similar?). Instead, I have to turn on the device manually, wait for the "home page", and then connect the USB cable; this way, the "Computer Detected" window appears.
Is this a normal behavior? Is there a way to let the "Computer Detected" window appear when connecting the USB with the device turned off?

Thanks
MIX