i know whats exactly wrong with it,and have helped many who had the same prob with the x2vga+.
x2vga+ on off switch is very buggy.actually there are 2 tiny switches under the main plastic knob(on off switch)when the switch is pressed both of them has to be pressed.when its in off state both those switched has to be off.however in some times when u press the on off switch,one of the 2 switched may loose the contact with the plastic knob and ,will not be pressed.like in the diagram below
----------->on off swith(knob)[---------](depressed)
= =
---->the 2 swithes (off state) = =
*********************************************************************
----------->on off swith(knob)[---------](pressed)
---->the 2 switches (on state) _ _ <both pressed
********************************************************************
FAULTY STATE
----------->on off swith(knob)[---------](pressed)
---->the 2 switches (on state) = _
= <one switch remains depressed