The computer was booting normally yesterday, but in the morning a message appears stating "Operating System Not Found". This can be caused by which of the following? (Select TWO).

Question

Options

• ABad memory module
• BBad USB controller
• CBad hard drive
• DBad IDE or SATA controller
• EBad CPU

• B
  5% (2)
• C
  84% (32)
• E
  11% (4)

Explanation

The 'Operating System Not Found' error means the BIOS/UEFI cannot locate a bootable OS on any connected storage device. A bad hard drive (C) is the most direct cause - if the drive has failed, developed bad sectors on the boot partition, or the MBR/partition table is corrupted, the OS cannot be found. A bad IDE or SATA controller (D) is equally valid - even if the hard drive itself is intact, a failed controller means the BIOS cannot communicate with the drive at all, producing the same error. Bad memory (A) typically causes POST errors or blue screens, a bad USB controller (B) would not prevent the primary hard drive from being detected, and a bad CPU (E) would prevent the system from POSTing entirely.

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