Why won't my BB 9220 turn on?

I was not using my BB 9220 from past 1 year. Then yestarday i tried to turn it onn but it was not working. Then i connected it to the wall charger for 1 to 2 hours... Then too it was not working.
I thought some battery issue would be there, So i bought a new BB battery. After inserting thr battery the phone Started completely and again it got switched off. Then i tried the 4h15m trick which i read it from blackberry forum. But i didnt got any result. PLEASE HELP ME !!!
Thanks..

SO after inserting a new battery, it started up? Did you charge up the new battery enough? Maybe you now have to reload your OS after all that time.