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The MBR is the main boot record, and when you boot your PC, the first thing the PC does is to look for the location of the operating system. This is what he finds when he examines the MBR. In case of a problem with the MBR, the operating system cannot be loaded and the PC is shut down.
You may receive a message informing you that a boot error has occurred because the operating system cannot be located, or you get no indication of what went wrong and only see a blank screen. The error can be the MBR 1 error, the MBR 2 error or the MBR 3 error (or the MBR 3 error). All this indicates corruption or errors in the main boot record. Rebooting the system from a recovery point should be the next step.
The cause of such a problem can be essentially reduced to two things. It is less likely that your PC will try to load the operating system for an external device or drive, such as an external hard drive, and that it cannot be restarted because there is nothing there. Try disconnecting the external disks to see if that’s the problem.
More likely, the main boot record was corrupted or lost for some reason. If this is the case, the ideal solution is to recover them from your system backup device with all the other missing files. However, many people have lost it or have never made a backup, so it is not an option for them.
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Changing the Boot Order in the BIOS
The MBR 1 error often indicates that there has been a change in the default boot order, and now your computer is trying to boot from a device that has not defined a boot procedure (for example, a drive that is used only to store data). If this is the case, you can easily solve the problem by changing the default boot order in the BIOS. To do this, follow the steps we have prepared below. Note that the exact steps may vary from one manufacturer to another.
- First of all, you must turn on or restart your computer. Some startup screens during startup should display a message asking you to press a specific key to access SETUP. Press the displayed key.
- If you did not click on the button in this window, you will need to restart your computer. If you have succeeded, you should run the BIOS configuration utility. Once inside, take a look at the menu above and look for the trunk.
- Alternatively, the input can also be called Boot Options, Boot Order, or similar. In some cases, the boot options are located in a different menu, such as Other options, Advanced BIOS
- Functions or Advanced Options.
- In all cases, a list of devices must appear in the corresponding menu. The order of these devices indicates the order in which the BIOS searches for an operating system or recovery drive to boot your computer.
- The first device in this list must be the hard disk on which the operating system is located. The bar at the bottom of the screen should contain instructions for changing the order. In the image below, you can use the “-” and “+” buttons to change the order.
- Then, make sure you access the Exit tab in the menu above and select Exit Change Recording. The bottom bar could display a keyboard shortcut for the same option. Select it and your computer should start properly.
Fix MBR from the Command Prompt
You can follow the procedure to successfully delete the error message.
1. Boot your PC with a Windows 7 installation CD/DVD.
2. click on Repair Computer -> Recovery Option -> Command Prompt.
3. enter the following commands to delete the error message:
Bootrec.exe /FixMbr
Bootrec.exe /FixBoot
https://www.cnet.com/forums/discussions/windows-7-mbr-error-1-on-startup-562265/
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