No display on the monitor
Tip: The following monitor troubleshooting steps are not for users who get readable picture that gets distorted when Windows opens.
Monitor is not on
Make sure the monitor is on. If no power LED (blue, green, or orange light) is seen press the power button until it comes on. If no light comes on after several attempts, make sure the connections are properly connected.
Computer is asleep
If your computer monitor was on, and you stepped away from the computer and upon returning it was black, it is likely that the computer is asleep. Try moving your mouse, clicking the mouse buttons, or pressing any key (space bar) on the keyboard to wake it up.
Connections not properly connected
Check the data cable
Make sure that you are connecting the monitor VGA cable to the back of the computer in the 15-pin connector as shown to the right or older computer 9-pin connection.
Check the power cable
If the data cable is plugged in, make sure it is getting power by verifying a light (blue, green, or orange) is on the front of the monitor.
If you see no lights on the monitor, make sure the monitor is connected to a working wall outlet and if the power cord is removable from the back of the monitor try replacing it with another power cable. If you can still not power on the monitor after trying another wall outlet and cable the monitor is bad and should be replaced.
Check the LED status
If the monitor has a light, but the status light is orange or flashing make sure the monitor is not in a suspend mode by moving the mouse or pressing a key on the keyboard. If this does not help turn the computer and monitor off and reconnect the data cable from the back of the computer, and if removable, the back of the monitor. Turn the computer back on. If you still encounter the same issue, continue reading through the other possibilities.
Monitor settings are not correct
Verify the brightness and contrast are turned up or adjust the brightness and contrast. If adjusting the brightness or contrast has no affect on the monitor continue reading through the other possibilities.
Does the computer beep when it is turned on or does it sound if the computer is working? If the computer does not beep or beeps abnormally, the computer is experiencing a hardware issue or is exhibiting a No POST. Run through the POST troubleshooting steps to determine the failure.
If you have followed the above recommendations and still have the same issue, your computer may have either a bad video card or monitor. The best method of determining this is to do one or both of the suggestions below.
- Disconnect your monitor and connect it to another computer. For example, a friend or family's computer or a computer at a service center.
- Borrow a computer monitor and connect it to your computer.
If your monitor works on another computer, it is safe to assume that the video card or potentially the motherboard within the computer is bad.
If another monitor works on your computer, it is safe to assume that your monitor is bad and should be replaced. While it may be possible to have the monitor serviced, it is often cheaper and easier to purchase a new monitor.