No signal in graphics output

yeah hi i was playing grand fantasia ts a game that dosnt need lots of graphic and then suddenly my monitor went black the i plugged my monitor into my my motherboard and it worked perfectly and every time i start my computer it pops up a window and says amd cataclyst controler dos not recognize pleass enable amd in display manager my graphics card dosent show in device manager and i dont know what to do i couldn have burnt i have a very good cooler plss help me if you can