I have a mac mini running Yosemite. It is primarily used as a home theater, but I do use it for other stuff on occasion. It is connected to a Samsung HDTV. The problem is that when I turn off the TV, the mini automatically goes into sleep mode. It is frustrating to have to keep the TV on when listening to music. I can't figure out how to stop this behavior. Any suggestions would be greatly appreciated! Thank you!