Final answer:
To install a new OS from installation media, you generally need to change the boot order in the CMOS settings to prioritize the media (e.g., USB drive or DVD) over the hard drive. This is done through the BIOS setup utility, accessible during the computer's startup sequence.
Step-by-step explanation:
When you're preparing to install a new operating system (OS) from installation media, you may need to change the boot order in the CMOS settings. CMOS stands for Complementary Metal-Oxide Semiconductor, which is a small amount of memory that stores the BIOS settings. The BIOS (Basic Input/Output System) controls the startup process and is essential for loading the operating system. To boot from installation media like a DVD or USB drive, the boot order has to prioritize that specific device before the hard drive.
To change the settings, you will need to access the BIOS during your computer's startup sequence, which is usually done by pressing a key such as F2, F10, F12, or DEL, depending on the motherboard's manufacturer. Once you're in the BIOS setup utility, navigate to the boot options menu, where you can change the boot order so that the installation media boots prior to other devices.