LCD keypad shield not showing text

Today my Arduino Keypad shield arrived, so I wanted to test it using the Helloworld example. When I connect it to my board, it just shows blank with row of black boxes please help!

We need some more information before we can offer anything other than guesses.

Did you look at any example programs that were supplied by the manufacturer or distributor of your shield. Most likely you have to provide different information in the 'constructor' (the LiquidCrystal lcd(. . .); statement).