Sounds like you want to enter the bios. If so when computer powers on press and hold "delete" until ths bios screen comes up. You may have to hold a different key down per your O/S and computer type. If you really want to get into the bios, make sure you know exactly what you want to chamge amd if in doubt, DO NOT MAKE A CHANGE. You can totally damage your computer if you change the wrong stuff.