*sigh* well i currently made my own computer for my gaming needs and my sister messed with the Power switch thing on the back while it was on and now when i try to turn it on my lcd screen does not pick it up or any other monitor the video card is a nvidia 8400gs well i can hear music when the computer boots up to login screen but bad thing is i can't see anything :[

So i was curious is there a way to restore this machine without a screen it does have a floppy drive im not sure if that can be of any help.
Or even better a way to fix the problem


thank you guys in advanced!.