gateway power on but screen stay black

Hi @ryannvlok,

What is the model number of the laptop?

Try connecting an external monitor to the laptop and check if it has a display when the laptop is on. Don't forget to press the appropriate function key(s) to connect the external monitor.

If the external display is OK (or if you don't have a monitor - TV perhaps if HDMI port in laptop) try shining a flashlight at an angle close the the laptop screen and check for any images. They will be very faint if they're there so trying in a darkened room may help to see them.

If you can see images (Windows desktop?) then there's a backlight problem with the screen.

Could be due to a problem with the motherboard, the video cable or the display.

More info i.e. make and model and results of tests suggested above, is needed from you to help you further