My bold 900 froze so i reoved the battery to insert it again like i normally do in such situations, but it wont come on again even when i plug it to d charger for more than 2hrs!! what should i do?

If It worked before you unplugged the battery, I would check to see if you have it in correct or maybe a contact is dirty. The battery must be in and recognized by the OS or the BB wont start.

If all else fails and it's new , bring it back to ATT.