power problem killed my motherboard?

We had a power problem while my acer aspire was in sleep mode. It blew the power supply on my son’s computer. he shut mine off. After the power problem was fixed my acer’s keyboard mouse and display would not come on. When you press the power button you could hear the beep and the fan and drive running but no input from the computer for the monitor. we tested the keyboard mouse and monitor on another computer and they work there. does that sound like a complete MB failure or could the processor be ok?