Testing HP 17bII+ Keyboard
Here is a testing procedure to check all your HP 17bII+ works. Press and hold [ON] button followed by [Soft Key 4], this will switch the HP 17bII+ into a diagnostic mode. Press  to select KB or Keyboard test. The screen darkens, now press the keys starting from the top left corner. As each key is press, the a band of dark line disappeared. At the end of the test, after you have pressed all the keys, the LCD should be clear. Press and hold [ON] button followed by [Soft Key 3], to exit test.