MacBook pro

I have a macbook pro that will only turn on with charger but the screen stays black. The keyboard lights up and you can hear sound when it turns on but the screen always stays black. I am not sure what all could be wrong with it so it is being sold as is for parts no returns consider it broken. It does not come with the original box or accessories. 13 Inch Screen 2.4Ghz Processor 4gb Ram Os Restored