I have a 23 inch Mac monitor connected to a Mac Pro. On a clean start up (all power off) the monitor doesn't turn on. Instead... the monitor stays black but there's a slow pulsating light on the monitor. When I put my finger on the "on" button... the light become solid for three seconds, or so, but the monitor doesn't turn on... and the like is back pulsating (even if I don't remove my finger). I noticed this morning that when I came into the office, the tower was turned off... but the monitor light was pulsating. After turning my Mac Pro off and on several times, the monitor does come on. Any ideas are completely appreciated! Love the Mac community!