the only reason your TV can go blank is because of the handshake that takes place between it and the video card (unless either device is faulty-which I doubt based on your desription.) There's an issue somewhere because of incompatibility, and the TV doesn't see the signal for a split second during the "talk"
this provides a MUCH better explanation than I ever could - http://cn.hdmi.org/pdf/whitepaper/AvoidingHandshakeProblems.pdf
after reading through your OP, slower, it's probably what Herr_Koos is suggesting
check the specs of your TV, or give us the exact model # and we'll check it