A couple years ago my 2009 mac pro was flashed from 4,1 to 5,1 and I upgraded to a 12 core 2.66GHz. As time has gone by I've slowly needed more power updating the GPU and then yesterday upgraded to a 12 core 3.46GHz. But after that upgrade the computer won't boot. The fans spin and the front light comes on but no chime or information put on my monitor. Anyone know what to do?