Why cant I turn on my laptop?

When I try to torn on my laptop Razerblade 15 with the 3070 ti inside; it opens fine but when I try to power it on it flashes a green light but only flashes a black screen on the actual screen. only method to get the screen to stop flashing is when i hold down the power button for 15s to make it flash white to turn off the laptop; problem has vbeen going on for a little over a week now