I just had the same problem when i was testing keypad lock on holstering.
When i unholstered and keyed in my password it went to a white screen with a small black progress bar and the word WPing. This went on for ages then it went to Scrubbing inter(couldn't read the words as it was covered by a timer)service memory.
This is not a good start to a blackberry trial our company is doing.
Reading the forums and being patient it all finally came back up but my contacts have gone, the browser is missing. My exchange server helpdesk mail is coming in but not my personal exchange account. Will have to set that up again i guess.
Considering i was able to break this BB just by testing keypad lock function does not make me confident in approving it's use for normal users.