Try to removed the battery of possible, also make sure that the charger is unplug. Press and hold power button for 10 seconds. (if you’re wondering we are not trying to turn on the laptop yet, we are doing a power drain) Now put the battery back in and try to power it. If it still don’t work, check if its a defective screen, buy using an external monitor. If the laptop has an HDMI port you can use your TV as an external monitor.
Charge it for 30 mins, then unplug the charger. Press and hold the power button and volume down for like 20-30 seconds. If that doesn’t wok try Press and hold the power button and volume up for like 20-30. Good luck.