Hi @blackheart ,
Just verifying that you have an Acer iconia W3-810 and that you are connecting the charger (AC mains adapter) to the DC-In power port (#6 in image below) in the tablet as a loose USB port should not prevent a tablet from charging.
(click on image to enlarge for better viewing)
Do you get any indication that the tablet is charging?
If not first try checking that the charger works by connecting a DMM (Digital Multimeter-Voltmeter function) across the output plug of the charger and confirming that there is 12VDC available. (if you don't have a DMM do you know anyone who has one and might be able to test the charger for you?)