When a system fails to boot properly, one of the first things to check is the initial boot loader. The bootloader is responsible for starting the system environment, and if it becomes overwritten, the machine may freeze during boot such as operating system not found. licensing utilities, اکتیو باکس often used for software licensing, can sometimes interfere with bootloader integrity, especially when they alter partition tables without caution.

One common issue occurs when an activation tool runs with system-level access and attempts to rewrite boot sectors. Some third-party tools, particularly those designed for illegal activation methods, may replace the original bootloader with a custom loader that lacks proper compatibility with the installed OS. This can result in a system that passes POST but displays a black screen.

To diagnose bootloader problems caused by activation tools, start by booting from a trusted bootable USB. From there, use built-in utilities like Boot-Repair in Linux to rebuild boot configuration. In Windows, running fixmbr and bootrec fixboot from the command prompt can repair the MBR. If the system uses UEFI, ensure that the ESP contains the valid EFI executables, typically located in the \EFI\Boot directory.

Another important step is to check the boot order in the BIOS configuration. Activation tools sometimes add their own entries to the boot menu, which may be selected automatically over the correct OS entry. Remove any unknown boot entries and set the correct OS entry as default.

Additionally, review last applied patches. If an activation tool was used immediately before the boot issue occurred, consider it a primary suspect. Uninstalling the tool may not be enough if it modified registry keys. In such cases, restoring from a previous restore point created before the tool was installed can often resolve the issue.

For advanced users, examining the UEFI boot logs or using tools like bcdedit on Windows can reveal invalid boot targets. Look for non-existent files.

It is also worth noting that some activation tools persist via firmware to avoid removal. In these situations, a fresh OS installation may be the only effective fix to ensure system integrity.

Always save user data before attempting any bootloader repair. While most bootloader issues are repairable, incorrect use of repair tools can brick the device. If you are unsure, contact OS vendor support. Avoid using unverified patches in the future to avoid future issues.