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1)Reason: a.The battery has no voltage. b.There is problem with charger,
as it has no output electric current. c.Low charging efficiency due to
external cause. 2)Solutions: a.Test whether the charger has voltage and
output electric current or not. b.Check if the charger is well contacted with
battery. c.Activate the battery with voltage and current 1.5 time higher then
the highest ones of battery. (Use this method only when the battery can't be
look on your keyboard for the key with the 'fn' meaning function and then press the up arrow key on the keyboard. This will make the screen brighter this happens when you are on your battery to save power. You can also do it manually by accident.
Get virus scanner/remover, and then try restore to a date when the computer was in full working order. If that does not work, try to backup valuable data files before original default factory settings, and get model-specific drivers etc from Acer and Microsoft websites.