Hi there,
I am no computer expert but it would seem that based on your previous answers, that there is something wrong with the LCD seeing as the backlight works but there is no display. The 2 solutions I could think of are:
1. Connect an external display and do a safe boot( Power + Shift) It probably won't help but it is best to try anyway.
2. If you are willing open it up and see if there is a loose connection or inspect for any damage to the LCD
Try them and report back