If you see no lights on the monitor, make sure it is connected to a working wall outlet. If it does not work in the other computer, the video card is most likely bad and needs to be replaced. Verify that the power supply voltage switch is set correctly. The following steps help you ensure the monitor is connected correctly to the computer. Next, verify the monitor has power by looking for a blue, green, or orange light. If the input voltage for the power supply … If your monitor is getting power, but you still don't see an image, the data cable … If you stepped away from the computer for a bit and returned to a black screen, the computer is likely asleep. While it may be possible to have the monitor serviced, it is often cheaper and easier to purchase a new one. The most common way that a computer "won't turn on" is when the PC actually does power on but doesn't display anything on the monitor. Connecting an External Monitor to Test the Display. This light is found on the front or the bottom of the monitor's bezel. If your monitor initially works and then goes blank when Windows starts, see: How to fix distorted video after increasing resolution in Windows. You can attempt to troubleshoot motherboard problems using the link below. If you hear beeping when you turn on your computer, run through the POST troubleshooting steps to determine the issue. Try removing video card from the affected computer and installing it in another computer. Ensure the monitor's data transfer cable is connected correctly to the computer. If you have a laptop, see our laptop screen is black page, see: My laptop computer screen is black. How to test a computer motherboard and CPU for failures. Monitor, LCD, and display help and support. The best method of determining this is to try the suggestions below. It may seem obvious, but make sure the monitor is turned on. If the computer doesn't pass POST, it won't turn on, and your monitor remains black. If you determine the motherboard is bad, or you cannot successfully run any tests, we suggest replacing the motherboard to fix the display problem. It should be completely inserted and firmly in place. If your monitor is getting power, but you still don't see an image, the data cable may be the issue. How to turn on a computer monitor or another display. If you still cannot turn on the monitor after trying another wall outlet and cable, the monitor is broken and should be replaced. Try using a different DVI, HDMI, or DisplayPort cable with your monitor. If no light comes on after several attempts, proceed to the next section. If this doesn't help, reconnect the data cable to the computer and back of the monitor, and then restart your computer. Try moving your mouse, clicking the mouse buttons, or pressing any key (e.g., spacebar) to wake it up. If your monitor and video card work with another computer, your motherboard probably has an issue. Most new displays utilize a DVI or HDMI cable and port. If you're able to view your monitor's settings menu even though the screen is blank, you likely need to turn up the brightness and contrast. 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 key. If you have followed the recommendations above and still have the same issue, your computer may have either a bad monitor, video card, or motherboard. The screen might remain black when there is a … Check if your monitor is turned on. If none of those actions work, press the power button. If another monitor works on your computer, it's safe to assume the non-working monitor is bad and should be replaced. If you do not see a power LED (blue, green, or orange light) on the front or bottom of the monitor, press the power button again. Try a different cable. How do I adjust my brightness or contrast on my laptop? 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