When your computer initializes, it goes into its Basic Input/Output System (BIOS) to run system checks such as memory test. After the initial checks, it reads from a tertiary storage device for an operating system.
1. When you turn on your computer, during the first few seconds when the bios is loading, look for some messages such as:
"Press [key] to enter setup"
or
"Press [key] to change boot sequence"
where [key] can be 'F2', 'DEL', "CTRL+ATL+DEL", depending on your system.
Entering setup goes into the BIOS menu of your system, entering boot sequence goes directly to the boot sequence menu.
2. Spam this key as soon as your comp power up. If you see the operating system (windows) loading screen, you're too slow, restart and try again.
3. The first BIOS screen will show many computer settings. The bottom of the screen will show the keys for navigation, and changing the settings, etc.
Example:
4. Look for a setting that says Boot Order, Boot Sequence, First Boot Device, Boot Management, or something similar and select it.
5. That screen list all the devices your system can boot from. Shift the desired device to boot from to the top of the list.
Example:
6. Once the Boot Order has been changed, save and exit the BIOS screen.
Example:
After saving the setting, your computer will restart itself.
When the system boots up, it searches for a bootable operating system from media specified by the top entry of the boot sequence. If a bootable operating system is absent in that entry, it will go to the next item. If there are no bootable operating systems, it will give a message similar to "Boot media not found"
~ Da Noob Geek
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