#Mac desktop screen display problem how to#

If the computer doesn't pass POST, it won't turn on or be responsive, and your monitor remains black. Once the computer is off wait a few seconds and then turn the computer back on by pressing the power button. You can tell a computer is off when it has no lights and the fans are not spinning.

To reboot a computer when you cannot see anything press and hold the power button until the computer turns off. If the computer was on when the screen went black, something may have happened that requires the computer to be reboot. How do I adjust my brightness or contrast on my laptop?.If you can view your monitor's settings menu even though the screen is blank, you likely need to turn up the brightness and contrast. Try using a different DVI, HDMI, or DisplayPort cable with your monitor. If your monitor is getting power, but no image appears, the data cable may be the issue. If this doesn't help, reconnect the data cable to the computer and back of the monitor, and then restart your computer. If the monitor status light is orange or flashing, verify the monitor is not in Standby mode, by moving the mouse or pressing the Esc. If you still cannot turn on the monitor after trying another wall outlet and cable, the monitor is broken and should be replaced. If the power cord is removable from the back of the monitor, try replacing it with another power cable. If you see no lights on the monitor, make sure it is connected to a working wall outlet. This light is found on the front or the bottom of the monitor's bezel. Next, verify the monitor has power by looking for a blue, green, or orange light.

#Mac desktop screen display problem how to#

How to connect a monitor to a computer.

Most new video cards have multiple connections and your motherboard may also have its own connection. Make sure the cable is connecting to the correct video port. Older monitors use a VGA cable, but most new displays utilize a DVI or HDMI cable and port. It should be inserted completely and firmly in place. Check the data cableД®nsure the monitor's data transfer cable is connected correctly to the computer. The following steps help you ensure the monitor is connected correctly to the computer. Loose or improper connectionsДЄnother reason for a black screen is, the computer isn't communicating with the monitor properly from loose or improper cable connections. If none of those actions work, press the power button. Try moving your mouse, clicking the mouse buttons, or pressing any key (e.g., spacebar) to wake it up. If you stepped away from the computer for a bit and returned to a black screen, the computer is likely asleep.

How to turn on a computer monitor or another display.

If no light comes on after several attempts, proceed to the next section. If you don't see a power LED (blue, green, or orange light) on the monitor's front or bottom, press the power button again. It may seem obvious, but first, make sure the monitor is turned on.

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