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[EJS]

Hello, I have x10 modules for about 25 years and never encounter this problem before, a few days ago I connect a PC to my bedroom TV  and now I cant control some x10 modules. I made some troubleshooting and when I disconnect the ac power cord from the PC power supply everything works perfect again. Any help appreciated.
Thanks and sorry for my English
Eddie Saez 

[Brian H]

Very common problem. PC Power supplies are known to generate power line noise or to absorb X10 power line signals.

You need an X10 type power line filter on the PCs power cord where it connects to the AC wall outlet.

If the PC is on an UPS. Then filter the UPS's AC cord as they also can be a problem.

Depending on how much current the power supply uses. The 5 amp X10Pro one may work but don't push it too hard. Near the 5 amp rating it gets warm and smells like it is getting warm.
Smarthome makes a 10 amp one 1626-10
The ACT AF120 is a 15 amp one.

[EJS]

Thanks for your response, strangely I have in the same room but in another ac wall socket 3 other PCs one with the same power supply that the one I have the problem and everything work perfect. I change the power supply for another one that I am sure that don't have the problem but the problem again returns. I think that may be is a socket wiring problem   I only have problems with that particular wall socket. I am going to buy the filters and see what happens.

Thanks again for you response and Merry Christmas and Happy New Year
Eddie Saez

[TimB]

Please let us know the results. Thank you.

Thanks for your response, strangely I have in the same room but in another ac wall socket 3 other PCs one with the same power supply that the one I have the problem and everything work perfect. I change the power supply for another one that I am sure that don't have the problem but the problem again returns. I think that may be is a socket wiring problem   I only have problems with that particular wall socket. I am going to buy the filters and see what happens.

Thanks again for you response and Merry Christmas and Happy New Year
Eddie Saez