Laptop Loads but screen goes Black on log in

Hello, I have a Toshiba Windows 8 laptop non touchscreen. I can log onto my laptop but as soon as I do, the screen goes fully black. I cant take the battery out because it is built into my laptop as part of the design... i have held the power button and unplugged the power supply and still nothing. I am getting a little frustrated because I work from home and I use this laptop. Please help me!!