when i remove the cotton bud (tab key lol) and plug the wire in it just shows all the screen characters, i think they call it the test screen.i think you have to remove the tab mate, before you enter the lead into the gat. thats what the manual says
So even though it says 'tab in' leave the charger plugged in and hopefully it will start charging?Try leaving it on charge for a few hours, the battery may be so low that it doesn't register enough voltage to kick the charging curcuit in.
On the other hand the battery may be goosed, and you'll need a new one.