Samsung galaxy tab 3 10.1 wont charge!!

A

AC Question

I have had my samsung galaxy tab 3 10.1 for around 7 months now and lately it wont charge! Unfortunatley it wont turn on now because it ran dead after it wouldnt charge, but when i attempt to a battery symbol with a circle comes up for a couple of secons, then the battery charging symbol comes on for a couple of seconds and then the screen goes completley blank, and this keeps going on an on, besides sometimes the 'samsung galaxy tab 3' symbol comes on, which usually means the tablet is coming on but in this case it doesnt and it just keeps going off in the same pattern again.

I have tried leaving it to do this all night, using different wall sockets, usbs and laptops, holding the on/off and home button for thirty seconds and trying to turn on while unplugged but none work!

please help!

thanks in advance :)