If an external monitor also doesn't work and you read through the above link, the internal graphics card, motherboard, or cable is defective. If the external display works fine, it's an issue with your laptop LCD screen or the connection from the motherboard to the LCD screen. Verify there is not an issue with the laptop graphics card by connecting a monitor or another type of display to the laptop. Next, try increasing the brightness on your laptop to verify that it is not causing your issue. Make sure your laptop is not in a power saving mode by plugging the laptop into the wall. If the picture is partially visible, the laptop's brightness that is set low or is being turned down by a power setting.
How to erase my hard drive and start over.If the problem persists, erase your hard drive and reinstall Windows. Restart Windows to see if it's a temporary issue and resolves itself with a reboot. One of the main causes for this issue is a corrupt system file preventing the operating system from loading, resulting in the black or blank screen. An indication of the operating system not loading properly and being at fault is if you can see the mouse cursor on the screen and nothing else.
