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[carl2860]

After new computer my X10 lights will not
allow me to controll them but will turn off
and on by themselves. I did install a RS
150-1111 AC line filter but no luck, if I
unplug PC all works fine. IS it the power
supply on the PC or some other part?

[Charles Sullivan]

It's normally the power supply (presuming
you've established that it isn't the monitor
or a UPS).  You probably need a line filter
specially designed for X10 use, e.g., http://
www.smarthome.com/1626.html

Ordinary noise filters can reduce the X10
signal as much as or more than the noise.

[Brian H]

Try an X10 type filter. Ohters may make it
worse.
My APC BX1000 UPS was a big problem until I
added an X10 Filter to the AC input cord of
the UPS.