The problem is that turtle.write() is simply not writing:
if year % 4 == 0:
if year % 100 == 0:
if year % 400 == 0:
board.write("It is a leap year", font=("Verdana",\
16, "normal"), move=True)
return
board.write("It is not a leap year", font=("Verdana",\
16 1, "normal"))
return
board.write("It is a leap year", font=("Verdana",\
16, "normal"), move=True, align="center")
Oh, and by the way, year is a pre-defined variable that is the year the user has entered:
All I got is this:
year = int(textinput("LEAP YEAR CHECKER", "enter the year:"))
Python Turtle Graphic Window:

I tried to write this. I even tried to use the Turtle() object.
But, alas, nothing happened.
What to do?
If I understand correctly, you want the turtle to write and that it shall appear on screen?
The following works for me: