

That’s why even error messages could not be displayed.
ACTIVE BOOT DISK REPAIR MBR CODE
It means the piece of code at the beginning of the MBR could not be executed properly. When we try to boot after hardware testing procedures, we see just blank screen without any messages. Lets overwrite the first 16 bytes with zeros.

What will happen if the first sector has been damaged (by virus, for example)? The location is always the first sector on the disk. The Master Boot Record contains the Partition Table for the disk and a small amount of executable code for the boot start.

It is very important data structure on the disk. The Master Boot Record (MBR) will be created when you create the first partition on the hard disk.
