the problem with a begining is that it would have to suddenly spring into existence from nothing. As Six pointed out this can not be, even if we were to try and define a begining to the universe we know you couldnt do it because its building blocks always must have been, stretching back into infinity. Of course this could mean that the universe does not exist and it is just a construct of our mind of course where then did the mind come from? A conundrum with no answer. Unless you elimnate the concept of begining and ending and accept that the universe simply is.
Perhaps life is the begining of the universe in that until life existed there is no change, the universe prior to life is limited to whatever natural state the elements are allowed given their combination and amount of energy. When you add life you add the possiblity of variation to the universe the birth of something completely new, conceptualy this gives a purpose to the universe. without a purpose existence is meaningless so to some extent the orgin of the universe begins when life begins