I am a college student, and I went home over Thanksgiving break a day early. My roommate was still home a day after I left. I left my Playstation at my dorm, but brought my HDMI cable home to plug my computer into my TV for Netflix and Steam and what not. Anyway, my girlfriend was playing her brother's Playstation the day after I left, when my roommate was still in the dorm. A message kept popping up saying that I was logged in, and then logged out, and repeated a couple of times. I believe my roommate was trying to play my Playstation while I was gone, but because there was not HDMI cable, he turned it on and off a couple of times before giving up. The only Playstation I share my account with is my girlfriend's, and I have never told anyone my password. Is there a way to check the last time a Playstation was turned on, or where an account was logged in from, so I can know whether or not my roommate was using my things without asking?