You need to go into the BIOS to alter this setting. There will be an option under one of the sub menus to change this. If you have the instruction book for your motherboard it will tell you how to do it. If not as the computer boots up you will see instructions at the bottom of the screen which will say hit KEY to enter setup. Replace KEY with the one it suggests. It is usually del. In example it will be hit del to enter setup. Hope this helps.