too. Thanks for the help all so far...not had a problem like this before! Re: Speed up and down Could be either the PC or the monitor - does the monitor have a seperate power brick? Move the stuff as far away as you can from the router and it's cabling, and maybe try a surge filter on the mains supply to the router. Re: Speed up and down Well it worked okay on the other devices when the problem computer was on but not connected to the router. It also seems to be running along very nicely at the moment using Ubuntu. Guessing it's a software or driver issue then?