How to Fix the 'No Boot Device Found' Error on Dell OptiPlex 9020

Описание: How to fix "No Boot Device Found" error on a Dell OptiPlex 9020

1. Press F2 several times until the BIOS menu appears.
2. In the BIOS settings, go to the General tab and click on Boot Sequence.
3. Choose UEFI from the Boot List Option.
4. Click Apply to save your settings.
5. Select Exit, and your computer will restart automatically.

Note: A power outage or shutdown can cause your Dell OptiPlex 9020 to revert to default boot settings due to a reset CMOS chip. If the CMOS battery is weak or old, it may fail to retain settings, causing the system to switch from UEFI to Legacy mode and trigger the "No Boot Device" error. Replacing the CMOS battery can help resolve this issue.

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