Is your BlackBerry wonky? Find out using the BlackBerry Device Self Test Application
On a BlackBerry Bold, the application allows you to test a whole variety of items, including the keyboard, LED status lights, and for dead pixels.
While it was reported that information about the test was available courtesy of a Knowledge Base article at the BlackBerry Technical Solution Center (link), the link gave us an error message at the time this article was first published.
Use the application with caution! We've tried quite a few of the tests without any apparent ill-effect, but the application does not appear to be intended for use by end users.