hi I'm new to this forum, I too have the HP C5180 and I have had nothing but trouble since day one! I have an Acer Pc vista home premium, netgear router (new at xmas to try and sort this problem out) and virgin media internet. I bought the printer in june last year and because it didn't seem happy on a 5year old pc running XP so in august i bought the acer. still no joy the printer kept disappearing error message was "no HP devices have been detected". I contacted HP via email and two solutions were offered, which I tried to no avail, then I made a 20 minute phonecall to tech support (premium rate!) which was a total waste of my time and money, and still the darn thing won't work, I have managed to get the printer to stop disappearing but now it has set itself offline and no matter what I do I cannot change it. I really wish I had never purchased it. My siter has exactly the same one bought a week later she has the same set-up as me Acer, netgear, virgin media and she has no trouble whatsoever, I don't understand it. I wonder what my rights are regarding sending it back to the retailer and getting a refund?