Urgent help from the community

Hello,
my presario C700 went of when i was playing a game
.when i turn it on, it doen,t
respond. Later open it and disconnected all hardware
and close it again.Now when i on it,it works perfectly but the
screen don,t glow neither it comes.The wireless light is orange
but the harddrive doesn,t show any booting signal at all as the screen
and the screen has no fault by then.
please i need help.what is the cause and how can i make it to work?