“No Operating System Found”—Anatomy of a Hard Drive Boot Error
When you get a “no operating system found” error message, your computer is telling you, in very plain English, what it is seeing. You booted it up, it looked for an operating system on your hard drive, and it failed. An issue like this can cut you off from all of the data on your computer… at least, until you fix it.
Now, there can be many reasons why this happens. But your computer isn’t quite perceptive enough to tell you exactly what is wrong. Generally, there are two major culprits for a “no operating system found” error message: