I have a new iMac, but had this same issue on my older one too. The problem is, I want to leave Wake for Network Access turned off, but every time I restart my computer, it's re-ticked itself again. I didn't migrate or copy the Library from my old computer, so i'm guessing its something I've installed on both. The only apps I've installed so far are; VMware Fusion, EyeTv, VLC, Speed Download, Logitech Control Centre & Transmission. All pretty standard apps I think. Anyone got any ideas why this might happen? Or what could fix it? Thanks.