BB Curve :: Its Not Loading After Battery Was Put Back In?

i recently took the battery out of my phone and once i put it back in the phone came up with the blackberry logo and the load bar, it get stuch around 2/3 of the way threw the bar. i've tried taking out the battery and putting it back in again, leaving it out for long periods and leaving it to load for long periods. none of that has worked. I've tried looking online for someone with the same problem but i can't seem to find anything that has worked. i've tired holding the return button thing for the safe mode thats been suggested and that didn't even work.im not sure what operating system the phone is either.