I have an eight-core 2,1 Mac Pro that is plugged into an UPS unit. Tonight the building I live in had a series of power surges that knocked out my UPS and Mac Pro. Once the power stabilized, I tried to turn the Mac back on without any luck. When I press the power button the computer's fan and hard drives start up and the graphics card's fan spin at high but the computer does not chime, the screens do not turn on, and the keyboard receives no power. The power light remains solid after I turn the computer on. I have tried unplugging the computer for a while, replacing the graphics card with another card, and going through the RAM pair by pair. Nothing seems to cause any different behavior. I have not been any issues with the computer before this. Please help with any ideas. I do freelance production work for a living so this is a serious issue for me. Thank you so much.