Sounds like classic RFI to me. RF is good RFI is bad. Put split beads on all leads between everything to and from computer. Be sure and use mix 31 beads. Please go to my web page here http://www.w3oz.com/newgrounding.htm and you may find some hints on ways to make it all better. I hope it will help you. 73 Larry W3OZ >From The Real Wizard of OZ W3OZ www.w3oz.com