In simple steps it's good to check with the weather, the computer has been left unused for a long time, sometimes the screen will appear later.
Due to voltage fluctuations sometimes the screen may not appear. You got to check for the power supply is good for your laptop. If the screen does not blink while you are using with the battery, then the problem is with the connection of the laptop with power supply.
Usually the screen blinking happens with display card not inserted properly. . Sometimes it happens when the laptop has not been serviced for a long time.Close the Monitor by lowering and raising the laptop, check whether the flicker occurs again and again. Screen cable might be a problem, else backlight or inverter can be damaged. Take it to a expert to fix it.
1. You can try to change the refresh rate of your monitor. Refresh rate - each second it refreshes is measured. Sometimes it's bad for LCD.
Choose Screen resolution-->click Adv. setting and monitor --> disable or check the " hide modes" also find the highest refresh rate and select it from the list.
2. Graphics card driver software update. Go to the Device manager, look for the display adapters - check manufacturer, model of the Video card.
Google for the same driver software for the same model and download it. update it. Sometimes the driver software gets corrupt, flicker might happen.
3. Check whether you are using the Direct X. Look for the Vertical Sync, it often locks the refresh rate, that will refresh the monitor.