try to do this:
-make sure you have selected "Shooting Info Display" on (record menu 4 - Memory 2)
-press info while in shooting mode thill the display is off
now if you power off the camera (while still having the display off) the next time you power it up the screen whould display the guide display info and then directly switch off the lcd.
You could also remove the mode info display @ start-up if you like (setting menu 1 - Guide Display 3/10/30''/off).
Remember that if you leave the display on when you power off the camera, the next time you turn it on the info display will be showened.
Hope it helps, and sorry for my bad english