Hi Shittu Temitope,
Welcome to Microsoft Community.
Understanding that you encountered Boot manager issues, I would like to confirm with you whether the SAMSUNG MZALQ256HAJD-000L2 you are using is a system hard disk or an external hard disk, if it is an external hard disk may be a problem with the hardware, it is recommended that you contact the hardware manufacturer to carry out testing and repair, if it is a system hard disk may be a problem with the system, it is recommended that you carry out a clean installation.
Disclaimer: At this point, we have exhausted all troubleshooting and I recommend that we try to perform a clean install to get your computer back into a working condition. Please ensure that you backup any important data, including Documents, Pictures, Videos, and more. After that, you can find instructions on how to install Windows 10/11 in the following article by MVP Andre: How to: Perform a Custom Installation of Windows 11 and Windows 10 - Microsoft Community
Thank you for your patience and understanding, if you have any questions, please feel free to leave us a message.
Best regards
Brandon | Microsoft Community Support Specialist