Follow the steps below to ensure your monitor is giving you the whole picture.
Step 1: Locate the contrast and brightness controls on your monitor.
Step 2: Adjust the contrast up to maximum. That will give you the bright whites required to illuminate an image's highlights.
Step 3: For the proper shadow illumination, adjust the brightness control until the 95% grey square is just barely visible. The 100% square should remain black, and there should be just a hint of tone in the 95% grey.
That's it! Now you'll see black and white images as they were intended.