A very thin line appeared when i turn on my laptop screen?

Laptop model-lenovo z50-70 59429623 hd screen, line is in red colour.it is appearing even when windows is starting and shutting down this is my new laptop just bought two days ago.

Return it under warranty, and ask for a replacement not a repair. Most shops will do this within 7days of purchase
This is a hardware problem with the screen of motherboard, nothing you can fix

It's broke. Take it back to the place you bought it.

Haha thats what happened to my old laptop, it just means the screen is kinda like broken or something:/

This sounds like a hardware issue. If you only bought it new 2 days ago, it should be under warranty. Take the laptop back to the store and discuss the issue with them