The solution to your problem lies in one of the following three areas:
1.) Your
acer aspire 4743 charger is faulty and is therefore not able to pass power to your laptops battery.
2.) The charging connector on the laptop has come loose from the contacts. Therefore a bad connection.
3.) Your battery is faulty.
I think possibility 2 is the most likely, although you will have to test possibility 3 by removing the battery and plugging in your charger and seeing if the laptop powers on.If it does power on then that rules out possibility 1 and 2 leaving a faulty battery.
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