Dell Laptop Inspiron 15 showing black screen


I am using Dell Laptop Inspiron 15- 3000 series model with Windows 8 configuration. It is showing black screen after start. In this even Dell logo is not appearing. Just black screen and cursor.
I tried with tapping F8 but it is not going in that mode also.
I don't want to format it.
Can anyone let me know the best solution on this?