I just got done rebuilding the LCS, and I noticed that I can turn on the Mac and get no boot, and a few minutes later the fans ramp up. Resetting the PSU gives me half a bong and no boot. Once I reseated the graphics card and got a full chime plus the white light in the front stayed on. Every other time use white light is off. Any suggestions? Update: Got it to run after I rebuilt the LCS once more, and the fans still jump up then back down. CPU/A is pretty toasty while CPU/B sticks around 130*F. My best guess now is some sensor is broken so I am running the Service Diagnostics to check for sure.