DUAL MONITOR MAJOR DISATER!!!! HELP

Hello,

I recently hooked up a acer external monitor to my compact presario v6404au because the lcd screen was smashed. I thought id be a hero and have a look at the resolution settings. I changed it to dual settings. I had the desktop background showing on the external but no tool bar or anything so i disconnected the screen from the laptop. Now i can not connect monitor back into the laptop? It keeps coming up with no signal. I have disconnected the broken screen from the laptop hoping it might of picked up the external as its default but no luck?


Please can someone help me? I just wanna get info off the laptop instead of paying a tech hundreds just to get something easy off the laptop.

=(