If the monitor still does not work, replace the monitor power cable. Replace or service the monitor if it still does not turn on.

If the power light comes on, the monitor has power, skip to Check for fan noises, beeps, and power lights. Disconnect the video cable from the monitor and make sure the monitor power cable is plugged into a power outlet.

At first setup, or under certain signal conditions, the monitor might not be able to switch to a new display resolution. If you need instructions for resetting your monitor, search the HP support website. Go to HP Customer Support, and follow the instructions to find your product. If you do not hear noise from the fans and the power lights on the computer are not on, the problem is related to the computer, not the monitor. To troubleshoot a computer that does not start, see Computer Does Not Start.

For flat panel LCD monitors, set the display resolution to the monitor’s native display resolution. With the power cable removed press and hold the power button on the front of the computer for 5 seconds. You can use these steps even though you cannot see anything on the monitor. If the new monitor works, the original monitor or its cables are faulty. Try connecting the monitor with a different video cable.

If all else fails and you don’t have a backup, take your hard drive out of your computer, connect it to a USB adapter, dock, or enclosure, and plug it into another known working PC. Sometimes your Windows installation is fine, but the bootloader—the data that governs Windows’ boot process—is corrupted.

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• If the power button from your case is already wired to these headers, you’ll need to remove those cables.
• Locate the twopower switch headers on your motherboard.
• These small headers are often labeled something like PWR_SW, with + and – symbols.
• Consult the motherboard manual if you’re having trouble locating thepower switch headers, as the labelling can sometimes be difficult to spot with the naked eye.
• If your motherboard doesn’t have an onboard power button, you can use a screwdriver to jump-start your system.

After you have reconnected the power cord, turn on the monitor to see if an image is displayed. If there is still no image, continue to the next step. Make sure that you have the monitor power adapter cord plugged into the power connector. Otherwise, check the video cable connection on the back of the computer and on the monitor.

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Make sure that it is connected properly and the connecting screws are tight. Turn the monitor off and then back on again to see if an image is displayed. If you see the initial HP logo screen but later lose the picture, go to Connect the computer to another monitor. If a message is displayed, the monitor panel is working and the problem is related to the video signal. For further troubleshooting steps, see, Flat Panel Monitor Displays Message about No Signal, Signal out of Range, Sleep, or Power Save.

If the LED light on the power supply is not lit, then it may be bad.To verify, use a known working external power supply from another machine of the same model, if possible. Unplug the power supply from the electrical outlet, followed by the downloadsdb DC connection from the back of the PC. The first thing to check is that your monitor is plugged in and turned on.

Disconnect all connected devices except the mouse, keyboard, and monitor. This includes removing USB flash drives and memory cards from card reader slots. 2nd,3rd links may be helpful, HP troubleshooting Computer Does Not Start and Computer Does Not Start and Emits an LED or Beep Code. I hope this helped you out, if so let me know by pressing the helpful button.