I have my MacBook Pro hooked up to a monitor on my computer desk, never had any problems. But lately when I leave the computer for a while and I come back to it the monitor does not come back unless I open the MBP, unplug the display from the MBP and tell them to plug it back in. Its very annoying and I have no clue what to do to fix it. I have disabled power saver and screen saver, yet it still does it. Any clues?