11-27-2012 06:40 PM
Hi and Welcome to the Community!
Anytime random strange behavior or sluggishness creeps in, the first thing to do is a battery pop reboot. With power ON, remove the back cover and pull out the battery. Wait about a minute then replace the battery and cover. Power up and wait patiently through the long reboot -- ~5 minutes. See if things have returned to good operation. Like all computing devices, BB's suffer from memory leaks and such...with a hard reboot being the best cure.
Hopefully, that will reset your keyboard to normal and allow you to enter the password. Otherwise, tether to your PC and type the password on the PC keyboard...the counter for both is the same, so at least you'll get more chances to rectify the issue with the BB keyboard before wiping your data.