During the boot process, it appear this error:
startpar: service(s) returned failure: udev
It seems to be a problem for the "mounting" of the webcam device:
dmesg | grep udev uvcvideo: Found UVC 1.00 device USB 2.0 UVC VGA WebCam (13d3:5710)
I have an Asus X53S.
I've also looked for a solution in bugs.debian.org, but I just notice that udev has lots of issues in Wheezy.