Hi, I am using a 2011 27 inch iMac as a second monitor (Thunderbolt connection) in target display mode (TDM) with a new 2013 Mac Pro but I am finding that this iMac is not waking up after the Mac Pro energy saver puts the monitors to sleep. I have another older iMac also connected and that one is waking up fine but my 2011 iMac is staying off when I wake the Mac Pro up by moving the mouse. The only way I can get it to wake up is to turn off TDM on the iMac and enable it again but that is cumbersome and makes a mess of all my open windows. I think perhaps this might have something to do with the firmware on the iMac or a thunderbolt issue but If anyone else has had experience of the 2011 iMac not waking up when used as a TDM display and has any suggestions on a solution I would very much appreciate it - Thanks!