@bradley007 you did not tell us what you already checked. If we make the assumption that there is power on your GB, I would next check components around the display and the power rails. Something like this
[image|2849542]
and this one
[image|2849543]
from [http://www.devrs.com/gb/hardware.php#hardgb|here] should help with the troubleshooting. Also, the beast got a few miles on it, check all the traces and capacitors for corrosion, delamination etc. Post some good pictures of your mainboard etc. with your QUESTION. That way we can see what you see.
[guide|21499]