Power on computer and hit f1 button about every second until the blue bios screen pops up.
Go to advanced bios features. Depending on version there should either be a list of hard drive, removabile drive, cd drive boot priorities or an option that says boot sequence.
If it says boot sequence then put your hard drive as the number one item, hit escape to exit out of that menu and escape agian to get to first screen, then select save and exit
If it has an itemized list of hard drive, cd drive, removable then go to hard drive, make sure your hard drive is selected, now hit escape to exit out, go to first boot device and make sure you select your hard drive, now it escape 2 to 3 times until you are back to the first menu screen, now hit save and exit