It's been on for about 24 hours because I'm downloading a large file. (It's been completely on, no sleep.) I was using it a couple of minutes ago when I noticed the battery was low. I plugged it in without turning it off and went downstairs. When I came back, it appeared to be shut down. I tried pressing buttons on he keyboard/moving the mouse to see if it just went to sleep but there's no response. Even pressing the power button doesn't do anything. Hopefully this info can help me out though: when I close the lid, the sleep indicator is on. (IIRC, it's supposed to flash when it's sleeping but right now, the white light indicator is solid and only goes off when I open the lid.) Any help would be appreciated.