An IT technician is troubleshooting a desktop computer running Windows that fails to boot. When powered on, the machine displays a black screen with the error message: "An operating system wasn't found. Try disconnecting any drives that don't contain an operating system." The technician notices a USB flash drive connected to the computer and confirms in the UEFI setup utility that the internal hard drive is detected and functioning properly. Which of the following actions should the technician take FIRST to resolve the issue?
- Disconnect the external USB drive and adjust the boot sequence in the UEFI firmware settings to prioritize the internal hard drive.Cevap
- BBoot into the Windows Recovery Environment (WinRE) and run the command bootrec /fixmbr to repair the Master Boot Record.
- CBoot into the Windows Recovery Environment (WinRE) and execute bootrec /fixboot to rewrite the system volume boot code.
- DAccess Advanced Startup Options, boot into Safe Mode, and disable the USB host controller in Device Manager.
Cevap
Disconnect the external USB drive and adjust the boot sequence in the UEFI firmware settings to prioritize the internal hard drive.
The error message 'An operating system wasn't found' occurs when system firmware checks the top device in the boot priority list and finds no valid bootloader. When a non-bootable USB drive is connected and takes precedence in UEFI settings, POST fails to load Windows. Disconnecting the USB device and setting the internal drive as the primary boot device resolves the issue directly.
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Troubleshooting Windows OS Startup and Boot Errors - Improper Boot Order and Removable Media Precedence