LCD Screen Not Working

I have set up all of the wiring correctly and I have copied and pasted the code from this website:

https://www.arduino.cc/en/Tutorial/HelloWorld?from=Tutorial.LiquidCrystal

but the text that is supposed to be on the LCD screen is not coming up, though the LCD screen is lit up and on

What is the display showing when powered up?

Hi, What model LCD, where did you purchase it and do you have a link to specs please? What model controller? Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?

Thanks .. Tom... :)