Reboot and select proper boot device

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Check the system setup to make sure the drive shows up.  If it does not, it's toast -- if you need the data back, it's data recovery service time. 

If the system still sees the drive, make a backup before proceeding.  Remove the drive, attach it to a working system by USB and copy the data you need to the working system.  Then proceed with a diagnostic on the drive (F12 at powerup).

As there are several things that can be causing the error, there are also several solutions you can try.

Fix 1: Change the boot order

As the wrong boot order is the most common reason for the error, this is also the first issue you should try and fix. Here’s how to do it:

1. Restart your PC.
2. Press a dedicated key on your keyboard to enter the BIOS menu. You will typically see the key you need to press on the first screen that appears when you turn on your computer. It could be Esc, Del, F2, F8, F10, or F12.
3. Open the Boot tab.
4. Change the boot order on your PC and list your computer’s hard drive first.
5. Save the changes you’ve made.
6. Restart your PC.

If changing the boot order hasn’t worked, try the next fix.

Fix 2: Check if your hard disk is working properly

Make sure your HDD hasn’t failed. Some of the most obvious signs of a failing hard disk are slow performance, strange noises and a large number of corrupted files accumulating on your PC. You can use one of the many programs available online that will let you know if your hard disk is in trouble.

Fix 3: Disable Legacy Boot (only works on UEFI)

If your PC is running UEFI and not BIOS, Legacy mode being on can cause the boot device error to pop up. If this is the case, here’s how to disable Legacy mode on your PC:

1. First, restart your computer.
2. Next, go to the UEFI menu by pressing the corresponding key. The right key is typically shown on the first screen that you see when your PC starts up. It can be F2, F8, F12, or the Del key.
3. Next, turn off the Legacy option. It will typically be listed under Security tab > Legacy Support.
4. Save the changes.
5. Close the UEFI menu.
6. Restart your PC.