MY TURTLES WON'T MOVE

Hi
I give my turtles a simple command, like
turtle.digDown()
turtle.down()
turtle.dig()
turtle.forward()

So I don't get why the turtle is working can anyone help me please!!
BTW I did put coal in the turtle and the only thing the turtle will do is turtle.digDown() but it won't continue the program.
I love this mod and i want to get more advanced with it but the stupid turtles won't work and please help me!
Thanks
Oh and some people have asked what version of computercraft in using, i'm us the the one for minecraft 1.5.1.

What version of CC are you on?

Are you on a server? Owners sometimes disable turtles for a variety of reasons.

EDIT: Fuel is only needed when turtles move from their parent block(the block they are placed on)

I'M using the version for minecraft 1.5.1

The turtle won't just take the coal and turn it into fuel automatically. Try using turtle.refuel() with the slot the coal is in selected, or run the refuel script with `refuel all`.

Did you just put coal in or did you use turtle.refuel() too?

Edit: Ninja'd. Really Lyqyd? :P/>

Oh ok i didn't know about the turtle.refule()
thanks ill see if i works and ill friend u guys who helped

Hey thanks to everyone with your help. What i forgot to use was turtle.refuel() and thanks to these people
Engineer
Lyqyd
Sammich Lord
SuicidalSTDz

Thanks