Final answer:
The computer searches for boot files based on the boot order set in the BIOS or UEFI settings. Users can change this boot sequence to prioritize different devices such as hard drives, CD/DVD drives, USB drives, or network sources by accessing the system settings during startup.
Step-by-step explanation:
The device to which a computer searches first to locate boot files is determined by the BIOS or UEFI settings, which can be configured through the system's firmware interface. When the computer starts up, it refers to the boot order established within these settings, which lists the devices in the sequence that the hardware will attempt to find the operating system's boot files. Typically, this sequence can include the hard drive, CD/DVD drive, USB drive, or network source.
It's important for the boot sequence to be set correctly, especially when installing a new operating system or troubleshooting boot issues. Users can enter the BIOS or UEFI settings by pressing a specific key during the startup process, which is often indicated on screen during the Power-On Self-Test (POST). Common keys used to enter the system settings include Del, F2, F12, or Esc, depending on the motherboard's manufacturer.
Changing the boot order is a straightforward process once you're in the system's BIOS or UEFI interface. However, care should be taken to ensure that the desired bootable device is placed first in the list if you want the computer to check it first for the boot files.