What you need to know is that the laptop runs on battery power, so it stays on as long as there’s juice. If the computer has been off for a while and plugged in, unplug it. Laptops draw some power just by being plugged into an outlet, even if they’re not on or charging anything. There are three scenarios that will turn your laptop back on: On batteries with no load attached (if you close your computer without previously unplugging it), on battery with no load attached and plugged in, plugged in letting the battery charge only with no active programs running.