OK, here's a weird one - this morning my internet connection on my mac pro was very slow - I assumed at first this was an ISP problem and switched my modem router on and off. Following this I couldn't get any connection at all but then saw that my iMac and Windoze laptop were connecting fine with a normal speed. Rebootin the Mac Pro makes no difference, but here's the strange thing - I can't even see my network listed when I try to connect but I do see and can connect to other unsecured networks that happen to be within range. The only thing I saw strange on the router log was a "Smurf" message, whether this was an attack or the repulsion of an attack was entirely unclear. Before the problem I hadn't made any network changes for weeks - I only added another HDD yesterday. Since then I've fiddled with the settings but have seen no change. Help!