100% charge but won't turn on

Hello,

I have a Samsung Note N7000, the phone is off and it hasn't been working for about 2 months, when I charge it the green battery comes up on display and charges to 100 percent but when I go to turn it on it does nothing, the screen goes black and then the battery with the circle in the middle pops waiting for the charging status to appear and then the green battery pops up.

Any help would be much appreciated
Thanks