My laptop turned on then flickered and went black screen.
Looked online, here possible solutions
1) Connect to external monitor using HDMI cable or VGA cable if your laptops old. If it works on external monitor but not lap top then it's your display. Could be the connector cable or the display itself. My connector cable was loose. I closed the laptop and pressed at the bottom of the screen where the connector joins to the motherboard and it started working again. If it doesn't then you need a new display. Mine would cost £39 from amazon. Youtube has plenty of fix videos.
2) Check your ram still works open laptop pull out each ram stick one at a time and turn on computer. It If works then replace damaged Ram stick. Male sure you can open your laptop.
3) Replace the CMOS battery. Cost less the £1
4) If all the above fail could be a motherboard issue. Replace motherboard.