If your password has any mix of numbers, letters, symbols, etc. in it, you must be very careful entering that on the BB in order to result in the proper characters. The BB keyboard, being small, requires that each key perform multiple functions, as controlled by the alt, caps, sym, etc. key modifiers, which must be used prior to each character in any password string. Check that to be sure.
Otherwise, please expand on the exact behavior..."can't verify" leaves us too much room to guess within. Exactly the steps you take and exactly the results you see, including what the screen says for error messages and such, with complete and accurate details.
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.