We used to run a KVM from our server rack to a desk on the other side of the room via a 25' VGA and PS/2 cables with no issues, keep in mind this was only going to a bunch of servers so resolution was limited to 1024x768. You might see some degradation with higher resolutions if you're using VGA. For video signal you may get better results with DVI. (See below) USB cables are also limited in length. USB 1.x is limited to 3 meters between hubs, and 2.0 is limited to 5 meters between hubs. Both permit a maximum of 5 hubs connected in series. Here's what Wikipedia has to say about DVI and cable length: The maximum length of DVI cables is not included in the specification since it is dependent on bandwidth requirements (the resolution of the image being transmitted). In general, cable lengths up to 4.5 m (15 ft) will work for displays at resolutions of 1920 x 1200. This resolution will work even up to 10 m (33 ft) if a special cable is used. Cable lengths up to 15 m (50 ft) can be used with displays at resolutions up to 1280 x 1024. For longer distances, the use of a DVI booster is recommended to mitigate signal degradation. DVI boosters may or may not use an external power supply. -- Andrew S. Zbikowski | http://andy.zibnet.us IT Outhouse Blog Thing | http://www.itouthouse.com