if i use a switch box to control 2 computers with 1 monitor and a switch between them, will there be a decrease in quality??

Hi Oli

Well I shouldn't imagine so as it will come down to the individual cards or on-board graphics.

Well actually...there is a decrease in quality - but not really noticable to someone unless they're a graphic designed - or stupidly observant (such as myself).

The more times the image has to stop and pass onto another cable will reduce the quality - each step takes a chunk out...just the same as audio.

Do you mean a KVM switch?