I connected my mid-2009 MacBook Pro to my HDMI TV until recently by selecting it as a monitor screen in System Preferences' Display Arrangement tab. When the connection failed, I was no longer able to get the Arrangement tab. Acting on advice to zap the PRAM. I found I had to do so several times to bring back the Arrangement tab and re-establish the connection which has now failed once more. Despite zapping the PRAM repeatedly, I can no longer get the Arrangement tab. Any help would be much appreciated.