Terry came into work and turned on his computer. During the boot process, the computer shut down. When he tried again, the computer showed the error message, OS not found. Terry called the help desk and explained the computer issue. The help desk technician asked Terry to open the computer.
Answer: Something to do with the storage device, in this case most likely a HDD.
Explanation: Operating System files has somehow probably gotten corrupted during the boot process, or the system drive connection to the motherboard have been severed.