A Windows 10 laptop fails to start and instead displays the message "Operating system not found." The drive's health has already been confirmed with manufacturer diagnostics. Which of the following actions should the technician perform FIRST to continue troubleshooting?
Disable Secure Boot in the firmware settings.
Boot to Windows PE and run CHKDSK /R on the system partition.
Replace the system's memory modules.
Verify in BIOS/UEFI that the internal drive is listed first in the boot order.
When Windows cannot be found at boot time, a common cause is that the firmware is trying to start from the wrong device. Verifying that the internal drive (or Windows Boot Manager) is listed first in the BIOS/UEFI boot order is a quick, non-destructive step and should be done before more invasive actions. If the boot order is already correct, the technician can then move on to Secure Boot settings, disk repairs, or hardware replacement.
Reference: Step 3 in Lifewire's troubleshooting guide recommends entering BIOS and ensuring the OS drive is the first boot device
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