I recently got this PowerPC G5 and I just tore it apart and blew it out. I put it back together, and it turns on, I don't hear the chime (speaker is plugged in), no beeping or error lights, and now the white led only lights up on the front when I press the power button, but the goes away. Nothing shows up on my screen, I took out the graphics card and plugged it back in. I can clearly hear it running and normal fan speeds and everything, I've took the RAM out and put it back, any help would be appreciate it.