Delayed Boot Sequence

So all of a sudden last night my machine started doing this for no reason. When I turn it on, the screen is black except for a small underscore in the top left corner of the screen. The PC starts up and everything lights up and the fans spin but the keyboard and mouse don't turn on. After AT LEAST 10 minutes it finally gets to the login screen, the peripherals turn on and everything is fine. I don't know why it's doing this now. I haven't changed any settings or components.