I think my nephews may have changed the boot settings on my PC as it tries to boot from a system disk, which I do not have. How do I fix this and restore the previous boot settings without a system disk?
Troubleshooting your BIOS Boot Sequence
Check for Disks Left Behind in Drives
In order to change your PC hard drive boot sequence you need to first access the BIOS utility. The BIOS setup utility contains different menus and settings that you can adjust to control your computer’s hardware. Before you try to change your BIOS settings, make sure that there aren’t any disks - CDs or DVDs - in the disk drive. If there is a disk in the drive, the computer might try to boot from it thinking that it is a system disk, even if it isn’t. It is more likely that your nephews left a disk in the drive than somehow got into and adjusted your BIOS sequence. If there is a disk in the drive, remove it and reboot to resolve the issue.
Enter the BIOS Setup Utility
To enter the BIOS setup utility, first turn your computer off. Wait for a minute, and then power it back up. When your computer starts up, it will either display a message along the lines of ‘press the [ ] key to enter setup/BIOS/system configuration’ within the first seconds. Most of the time the setup access key is F2 or Del. When you see this message, press the appropriate key to enter the setup page. If your computer displays a brand logo instead of this message, pressing Esc or Tab should remove it. The exact instructions to enter the setup page differ between computer brands, if you have any trouble consult your user’s manual for instructions. If the message flashes on and off the screen too quickly, you can press Pause/Break to freeze the screen and then press any other key to continue.
Find the Boot Setup under Boot Order Menu
Once you are in the BIOS setup you can change the boot order. Use the arrows on your keyboard to move around the menu and find the listing for Boot, Boot Order or Boot Options. Different computer manufacturers use different menu options, but it shouldn’t be too difficult to find the Boot choices. If there is not a Boot Options listing, you can look for Boot setup under Advanced Options or Advanced BIOS features.
Adjust the Boot Sequence Order
Once in the BIOS setup, follow the directions to adjust the boot sequence order, usually using the + and - keys. Usually, computers are set to attempt to boot first from a disk, in case you need to restore or repair an installation, then second from the hard drive. When you are finished choose the option to save changes and exit the menu. This should do it. Your computer should restart automatically now, if it doesn’t, then reboot and the sequence should be changed.

Updating the BIOS (Basic Input/Output System) is often a necessary process that helps to maintain the proper functioning of our computers. For example, updating BIOS often fixes problems, offers new features, or resolves compatibility issues. However, updating the BIOS is fairly risky and shouldn’t be entered into lightly. Unless you are experiencing major problems, you should not update the BIOS. When you update your BIOS, the old one is replaced with the new one, leaving your system inoperable if something goes wrong. You should also be aware that flashing or updating your BIOS can fry the motherboard if it is done incorrectly.