Hi there I just got a barco 808 graphics and am just doing the basic setup. I got to the point of focusing lenses, easy enough. Then in the manual it say find the raster and move it into center of crt, put brightness way up and contrast down, but for the life of me I cant see a raster!. I have experimented a lot what is it I am looking for? I assumed it was a darker rectangle in the crt border but I dont know.