In no particular order...

1. Turn down the Contrast...

2. Double-Check your LCD wiring

3. Some LCD's need DB0-DB3 grounded to work in 4-Bit Mode.

4. Some LCD's need their R/W pin Grounded

5. Increase LCD_COMMANDUS to 2000 and LCD_DATAUS to 50 (values which seem to work with most LCD's).

6. Check your code is the same as that which you have posted... if you have a typo in the LCD DEFINEs it will not throw up an Error at compile time.