Replace the Timer ⏱️ if it has one or else replace heat relay or control board. Good luck 👍🏽

Lucille, does it give you any beeps sound when you try to power on your laptop.also,replacing the LCD display shouldn't affect booting process unless you have correctly reconnect all the video and audio wires when you replaced the display. I would need additional information if I can help you. Good luck Best Shawn.