After using a third-party disk optimization software package, a technician restarts a laptop and receives the message "No operating system found."…

The error "No operating system found" indicates that the system's boot loader cannot locate the OS, even though the BIOS recognizes the physical drive (SSD). This is a classic symptom of a corrupted Master Boot Record (MBR) or boot configuration data. Disk optimization software can inadvertently damage these critical boot sectors. Booting from Windows installation media provides access to recovery tools, such as Startup Repair or the command-line utility bootrec.exe, which can be used to repair or rebuild the MBR and restore the system's ability to boot.

A. BitLocker issues typically manifest as requests for a recovery key, not a "No operating system found" error.

B. A failed CMOS battery would cause a loss of BIOS settings, but the prompt states the BIOS does recognize the SSD.

D. Isolating the system is a step for malware remediation, not a troubleshooting step for a boot failure of this nature.

1. Microsoft Corporation. (2023, October 16). Use Bootrec.exe in the Windows RE to troubleshoot startup issues. Microsoft Learn. Retrieved from https://learn.microsoft.com/en-us/troubleshoot/windows-client/performance/use-bootrec-exe-in-windows-re-to-troubleshoot-startup-issues. (This document details the use of bootrec /fixmbr to resolve MBR corruption).

2. Purdue University. (n.d.). ITaP Technology Support. Retrieved from https://support.purdue.edu/goldanswers/167433. (This university guide explains that "Operating System not found" errors are often due to a corrupted MBR).