No Display. my mother board model gigabyte GA-945PL-S3, i try to up date the Flash Bios, during i

Question

my mother board model gigabyte GA-945PL-S3, i try to up date the Flash Bios, during i reboot the pc no more displat on monitor but all component are work speacialy the Processor, i try to change VGA Card but still the same also Memory pls help me how can i return to original set up Ty