MacBook Pro

I was the first customer in Naples/Fl who bought the new MacBook Pro on Febr. 24 in the  store;
after a while I noticed flickering on my 24" monitor; it became black for a split second; the problem continued; Apple replaced my Pro without asking questions; the second Pro still had the same problem; I got my third Pro recently - the problem stills continues; I disconnected the monitor but the same on the Pro itself; I wrote to the store manager and I am waiting for their answer;
I have heard about this problem from different sides.
Marcel Bobbe - USA