A nerd does not fix a computer because he feels obligated. He fixes a computer because machines should work, and when they do not it is an affront to all things right, good and true.
Try bringing up the boot menu. On an ASUS that is usually dribbling the Esc key at startup. Or try accessing BIOS. On an ASUS that... is also usually dribbling the Esc key at startup, and scrolling down to "Enter Setup."