Hi, I just finished building my first computer! I have the Gigabyte Z77-DS3H MOBO. I have a Mac USB keyboard and mouse I have tried to enter boot menu from both the front and rear USB ports. The only message I get is It repeats the message if I press a key, so I know it senses my keyboard. I'm hoping maybe its a mac/pc keyboard difference. Did I do something wrong with my build?!