Using the following images set brightness and contrast as follows:

Using the grey scale wedge below you should be able to easily see each of the graded steps. The first step should be 0 black (it should match the black border of your monitor). The usual setup method is to set the monitor's contrast to maximum or near maximum and then adjust the brightness control until the black steps can just be distinguished from each other.

Using the following image you should be able to see a difference in shade between blocks X, Y and Z and also, preferably A, B and C. For best viewing results there should be a roughly equal step between each band.

If you want to be more critical about monitor set-up use this image:

Critical Monitor Calibration

You should be able to see all the bands within the low light and highlight areas.