Answer to "Powering off while typing"this happens commonly !!! its a screw that is loose and rolling around in the chromebook and it is where the chromebook magnet is to turn it off and the dell screws are like magnets so the will shut off the chromebook (just take off bottom and look by the charger port for a loose screw!!!!
Answer to "Chromebook not powering on?"Yes 1 hit power refresh if it doesn’t work then try 2 unplug and re plug in the battery if it doesn’t work then try 3 Take off the bezel then remove the lcd/screen then unplug the screen and re plug in and if it doesn’t work then try 4 unplugging erything from the motherboard and then re put if it doesn’t work then its dead (motherboard) OR TRY USEING A HDMI CABLE AND IF IT SHOWS ON THE TV OR MONITOR THEN ITS A SCREEN CABLE ISSUE OR LCD ISSUE OR MOTHERBOARD ISSUE( screen connector to motherboard issue) (go to ebay and get a cheap used one for around $10)