Welcome to TF, Mack!
First thing I would try, get a flashlight. Shine it on the screen, at a 45* angle, if you can see your Windows desktop, or anything, your backlight is burned out.
As you said you had it for 6 months, it is still under warranty. You can send it into Toshiba for an RMA. You pay the shipping to them, they fix whatever is wrong, they send a fixed/new product to you. This is free, otherwise.
Make sure you backup your files, though. Can't guarantee your going to get the same system back, files untouched.