When you start the laptop, there are lines running through the manufacturer’s logo. Windows will not load. The same lines running through the logo appear on the external monitor.
Video card failure.
Possible troubleshooting steps and repair solution:
When you have lines running through the laptop logo on both internal and external screens, most likely the laptop has a failed video card.
If the video card is a discrete module, you can try reseating the card. Unplug it from the motherboard and plug it back in. It’s possible this failure occurs because of a bad connection between the video card and motherboard. If reconnecting the card doesn’t help, you’ll have to replace the video card.
In most laptops, the video card is integrated into the motherboard and cannot be removed and replaced separately. If the video card fails, you’ll have to replace the whole motherboard.