So, my Mac Mini would not start back up today. I mean nothing at all. So I opened it up and everything was seated and looked ok. So I decided to check the PRAM battery. It tested fine on the meter, and when i put everything back together and plugged it in, it came on without me pressing the power button. The long and short of it is, the power button does nothing even though the computer is running fine. I shut it down and tried to power it back on and it was dead again. Pulled the battery and put it back in.....boots back up. It's very weird.