Has anyone else observed that their display does not actually sleep under 10.9.2? My screen blanks at the preset time, and it takes a keypress to bring it back, but the display's power LED never goes from blue to orange. I also never get the box on the screen that says the display signal has been lost. The temperature of the monitor after "sleeping" for a while also reflects this. I have done a reset of SMC and PRAM. Hardware is a 2011 Mac Mini and a NEC PA271W monitor. The monitor sleeps correctly under 10.9.1 and prior versions back to 10.7.x.