Laptop Dual Monitor Issues.

Here´s my story.

I have a Acer laptop wich had it´s LCD screen broken, while I can´t reapir it, I decided to hook up a external monitor on it´s VGA exit.

The problem is, once I turn the laptop on, the external monitor shows the boot, and the laptops LCD remains off, that´s what I wanted it to do. But, when windows finishes loading, my external monitor enters standby mode and my broken LCD Powers On.

There´s anyway I can fix that?