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After turning on the CAB2 with the CTC button, if you see the home screen which says "scroll to continue" (since you have a completely blue screen, hold the CAB2 at an angle which allows you to see the printing on the screen faintly...tip the top of the CAB2 down and look at an angle...possibly under some direct lighting) then rotate the big red knob until you see "SYSTEM SETTINGS" and "Display Contrast" and push a numbered button for the desired contrast...like maybe push #5 for 50%. If you do not see the home screen at first, push CTC again to see the home screen. "SYSTEM SETTINGS", by the way, has a variety of settings. 

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