Unable to charge my Ematic – Edan tablet

Hi all,
I purchased recently an Ematic – Edan XL 9 inch tablet and it has 8 GB memory. Till last week it was working fine and getting charged by using AC adapter which I got along with the tablet.
This week It does not recognize this adapter even if I plug it in. The charger is not broken, but it is not working somehow. I use to have the USB cord and now it is also not working. I am not sure whether the problem is with the adapter or system itself.
How can I To troubleshoot this problem? Any help will be greatly appreciated. Thanks in advance!
