please solve this problem and explain how did you do it, do not copy other tutor's solution please

6. A computer has a shape of a box which is 15 cm x 40 cm x 40 cm. The outer cover is thin sheet metal with a surface emissivity of 0.71. This cover encloses the computer electronics, which generates 35 W of heat. All the six sides of the computer box radiate uniformly and are at the same surface temperature. The room in which this computer is located and completely enclosed) has walls at 25 C. You may also assume that the computer has been turned on for a long time, and that the computer cover surface is a "gray" surface, and that the heat transfer due to conduction in the air is negligible relative to the other modes of heat transfer, and that natural convection is negligible. a) Find the surface temperature of the computer if the air in the room is quiescent (still). For full credit, you must derive the equation first (starting with the energy balance defining the system) before solving for the final answer. b) Find the surface temperature of the computer if there is a fan in the room which moved the air such that the convective heat transfer coefficient is 5 W/ mK. Assume air temperature is also at 25 C