Black, white,or blue, are any problems on the screen, can be one of two things.
So you have to find out if it is the screen its self or if it is the GPU (video card) this is easy
to do connect a second know good monitor to your computer, if the problem goes away you have a bad monitor or screen.
http://www.ccl-la.com/blog/ this site will help with repairs...
Search the below for more information.
Troubleshooting laptop with backlight failure.
How to test LCD screen inverter in a laptop.
Laptop has bad video on the LCD screen. What is wrong?
How to troubleshoot and fix laptop video problems.
http://www.pchelpsoft.com/hh-online/p/USB%20Device?gclid=CIi_3fiZ7bYCFVN0MgodLlkAGQ
Hey, I enjoyed your question, I have worked as a technician most of my life, I hope I have helped you...
Good luck...