Often, the cause of a black screen is simply a poor physical connection. The display cable—HDMI, DisplayPort, VGA, or DVI—may be loose, frayed, or unplugged at the PC or monitor end. What to try: ...

Some Windows users are reporting when a program or app window is maximized, it leaves blank space on the top part of the computer screen. This is an annoying issue and can be caused by a lot of ...

Avoid doing so, and check for persistence of the issue. One reader writes: "I have experienced the blank screen on wake with my MacBook Pro (1.83 GHz, extra 1GB RAM from OWC) several times.