Lumia 620 - Device not detected

Hi,
I've been using my 620 for a month now with no problems.I use the phone for developing purposes (Visual Studio 2012 + Windows 8 Pro).
Around 8 days ago, I received a pack of updates of the Nokia bundled apps which I installed and after that, when I connect the phone via the USB cable, the Phone is not detected on Windows.
I read lots of other threads about this kind of problems, even went through reinstalling all the Windows Phone SDK, reinstalled drivers (http://support.microsoft.com/kb/2749484), tried 4 different USB cables, on all the ports of my computer, tried 5 different computers too (two of which have Windows 7, three have Windows 8), removing the SD card, and the Phone still is not detected. The charging icon appears and the Phone charges OK though.
The Phone does not appear on Windows Device Manager under any kind of label (No Unrecognized Device either), Windows Explorer does not show any drive (MTP), its like the cable is not connected (although it charges without a problem).
I don't have the Amber update yet.
Is there any kind of setting (possibly hidden?) that controls the USB behavior of the phone? I read there are no Diagnostics tools for WP8, but, is there any way I can check if there is a hardware problem?
Thanks in advance!

The vol down + power is only a reboot. Perhaps you might consider a reset from Settings>about>reset your phone.

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