Usually, this means the motherboard is bricked and must be returned to ASRock to have the bios flashed using special equipment or to have the bios ROM replaced. Some boards have replaceable bios ROMs but you'll have to contact ASRock to find out if yours is and if they are still available on a board this old.
Prior to that, you can TRY to reset the CMOS hoping on a long shot that it might work. Doubtful, but worth a try. Unplug power. Remove the cmos battery for five minutes. Press the power button for 30 seconds during that five minutes. Then put the cmos battery back in, plug in the power and power up. If there is still nothing, you will need to contact ASRock or purchase a replacement motherboard.