Using a can of compressed air or what ever will not work on the 9000. The TB itself sits in a housing surrounded on all sides. I doubt very seriously you broke anything, I just think it's not making proper contact.
In order to change the TB on the Bold, you must preform surgery. You must take the entire device apart to get to it. It's rather easy as long as you take your time. All you need is a T5 Torx drive. Check Sears or your local hardware store. You can find a disassembly video at the link below. Just be sure to take your time.-->
BlackBerry 81xx/83xx/88xx/9000 OEM trackball- Microsoft, Tools, Nokia, Mobiado, Panasonic, Apple, Samsung, Acer, SonyEricsson,
Select video.