I hope no one minds me starting this thread over but I could use some help. I have several X-10 Powerhouse switch modules through the house (<2000 sf) all working fine except two (originally the problem was with one but I added another). Both of these wall switches refuse to work as long as I have either of two computers turned on. The third computer doesn't seem to bother it. Without the computers on, all switches work just fine. I recently added a Leviton 6201 amplifier/coupler thinking that would clear up the problem with noise interference but to no avail. Would changing the house codes or moving the transceiver help or do I need to invest in a noise filter? The prospect of another investment has my wife leaving the yellow pages open to 'Attorneys' so I'd like to know of any alternatives.