Strange issue this morning: I wasn't able to "wake up" my iMac (2011) this morning because my keyboard, trackpad and mouse (all 3 wireless) weren't "connected". When I got to the screen to enter my password to get into the system (by pressing power button because my wireless devices wouldn't wake iMac), I wasn't able to enter my password because my devices somehow disconnected from iMac while in sleep mode. (Keyboard has fresh batteries). I eventually had to do a "hard reset" by holding down the power button until it turned off. When I restarted my iMac, everything (keyboard, trackpad and mouse) all connected again, and I was able to enter password. This is my first iMac and the first time this happened. Is there another way to solve this issue if it happens again other than "hard re-booting" the system?