Quoted from schudel5:Node board 8 for GB Pro seems to have taken a dump. I went into diagnostics and the board shows up grayed out. Installed new ethernet cable...no change. Game is a year old but HFS is that board expensive!!! Marco (out of stock) shows it at $289!
http://www.marcospecialties.com/pinball-parts/520-6985-72
Look for the colored led's. it looks like your 5 volt supply on the node is out.