Notice: To restore the system image from a GPT disk to an MBR disk without boot issue, make sure the system supports UEFI boot mode. Wait as Dell restores your BIOS to a previous version. With it, you can restore the system image created on a BIOS-based computer (MBR disk) to a UEFI computer (GPT disk) and vice verses. This also will initiate the installation of the previous BIOS. This will force your Dell computer to boot from the BIOS media. Make sure that that your BIOS media is still inserted. Insert the media as instructed and complete the download. Depending on the version you have chosen to download, you will be prompted to use a floppy disk or another external storage device to download the BIOS. These instructions will differ from one update to another. Sometimes the latter can cause issues if settings were changed to take account for changes in hardware or OS after install.Double-click to expand the instructions. Most often, resetting the BIOS will reset the BIOS to the last saved configuration, or resets your BIOS to the BIOS version that shipped with the PC. Now to answer your question about what resetting BIOS does.
Hopefully, your problem can be solved without having to modify the BIOS. That being said, someone posted an answer that seems to relate to your issue specifically. If you are having an issue with the PC, try to fix it before attempting anything with the BIOS and talk to someone who knows about computers. Since you do not know what resetting the BIOS to factory settings does, I would highly recommend against it. This does not happen often, but there is a small possibility it can happen. Although its not something that happens often, you can render your machine inoperable, even to the point where it can not be fixed. Resetting/modifiying a machines BIOS is not something that you should do on a whim.
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