Are you sure it's not just the cable?
I have exactly the same problem, it flashes black 2 or 3 times.
However, my laptop is whats connected to the tv via hdmi and I just stream movies and tv.
The lappys not that old, but I had a cheap woolies cable connected to it, I went to eb games and brought a good quality cable and it stopped doing it.
A few weeks ago I put the old cable back in because my son had taken the good one for his xbox and it started doing it again.
I have exactly the same problem, it flashes black 2 or 3 times.
However, my laptop is whats connected to the tv via hdmi and I just stream movies and tv.
The lappys not that old, but I had a cheap woolies cable connected to it, I went to eb games and brought a good quality cable and it stopped doing it.
A few weeks ago I put the old cable back in because my son had taken the good one for his xbox and it started doing it again.