My ASUS notebook won't load windows with black screen

Hello,

I have Asus K551LB . It worked very well until yesterday . Yesterday morning
when I wanted to turning it on I saw POWER KEY and other lights in the front of the laptop were on but screen was black and never work . please help me . I read some article that indicate removing battery and holding power key 30 seconds resolves problem but my battery isn't removeable . please help me with a alternative solution . this is urgent guys ...