Do you have another tablet like that, which works?
If so then try taking the battery (if possible) out of the tablet that isn't coming on or charging and put the battery which is in the working tablet into the other tablet, if it works then you know the battery has gone bad. (make sense?)
However if you don't have any other tablets try replacing the battery.
Though the port thingy where you put the cable in to charge could of fried whilst it was charging..
Maybe the battery as gone bad.
Do you have another tablet like that, which works?
If so then try taking the battery (if possible) out of the tablet that isn't coming on or charging and put the battery which is in the working tablet into the other tablet, if it works then you know the battery has gone bad. (make sense?)
However if you don't have any other tablets try replacing the battery.
Though the port thingy where you put the cable in to charge could of fried whilst it was charging..