If your laptop screen goes pitch black when you are try to wake the computer after sleep mode, remove both the power cable and battery, wait for some time and then put it back!
If that’s the case for you, you may try these steps to make it work:
- First if the computer screen gets frozen, when you are working something, try ALT + CTRL + DEL or restart your computer.
- Make sure your computer is not in sleep mode or hibernate. You may wake it from hibernation by pressing the power button or by moving the mouse or pressing any button if it’s in sleep mode.
- Make sure the power cable to the monitor is working, in case if you are using a desktop.
- Make sure you have connected the monitor to the computer or to any other external display device (like a projector). If a laptop is connected to an external device, the image can be displayed in either the laptop screen or the external device or both. Use the keyboard shortcut, fn+f4 (Function + F4) repeatedly to switch between the options.
