American Megatrends is the company that makes you AMI BIOS.
Your computer is probably going straight to the BIOS setup screen. This could be cuase by a stuck key on the keboard, or if you the CMOS battery on your motherboard is dead. There should be a menu displayed allong the top and/or bottom of the screen, which you can access via the cursor keys.
You could try this:
If you have exit on the top menu, use the cursor keys to select it, and hit enter. Then Cursor down to choose "Load setup Defaults", and hit enter.
Hit F10 to save and exit.