First, check your battery to make sure that it is properly inserted. Next, plug in your laptop and and look for the battery icon below the mouse pad. Your computer's battery is working correctly if this icon is lit up. Also, make sure that your charger fits tightly when inserted into the charging port. You will need to replace the charging port if the charger fits loosely within in. In order to ensure that your charger is working properly, look for any tears or exposed wires in the charging cable. It is also a good idea to test another charger on your laptop to determine if your current charger may be faulty.
You must first remove the fan cover. After that, use a can of compressed air and blow directly into the fan. Blowing into the fan via mouth will not remove the dust.