Title screen imagegui won't change?

For a title screen for my game, I have the title as an image gui. It's supposed to change to another image to give a "glitchy" effect, but instead it doesn't appear at all and I don't get any errors either.

My code:

while true do script.Parent.Image = 4755369586 wait(math.random ( 0.9, 4.0 )) script.Parent.Image = 4755377876 end

The Image property needs the content ID of the image, not just the asset ID. Try doing this: script.Parent.Image = "rbxassetid://4755369586"