This study aims to investigate the influence of an external magnetic field on a hydro-elastic semiconductor medium using the framework of photo-thermoelasticity theory in two dimensions. It seeks to understand how the magnetic field affects the coupled interactions between thermal, mechanical, and electronic fields in a fluid-saturated porous-silicon semiconductor, with potential applications in magneto-sensitive semiconductor devices. Normal mode analysis is employed to derive the governing equations for wave propagation. The study analyzes non-dimensional temperature, displacement, mechanical stresses, carrier density, and excess pore water pressure in response to the magnetic field. Realistic boundary conditions are incorporated to simulate practical scenarios and explore the intricate interactions between electromagnetic, thermal, and mechanical fields. The findings highlight the significant role of the magnetic field in modifying the behavior of semiconductor materials. The magnetic field impacts wave propagation properties by altering thermal, mechanical, and electronic responses. The results emphasize its potential to enhance or dampen material behavior, demonstrating applications in geophysics, biomedical engineering, and the design of magneto-sensitive devices. This study provides valuable insights into the complex interactions of electromagnetic, thermal, and mechanical fields in porous-silicon semiconductors. The innovative use of photo-thermoelasticity theory and normal mode analysis offers a comprehensive understanding of multi-physical responses, paving the way for advancements in the development of semiconductor devices and technologies sensitive to magnetic influences.