Could someone advise me on a good power line filter to filter out electical spikes? A couple weeks back the electric motor on my furnace fan died. Since then, whenever the furnace fan starts, there's some disturbance on the computer monitor screen. I'm not sure how serious this is, but I'd like to put a stop to it. I've got a cheap Magnavox ($35) surge protector with a 15 amp circuit breaker, but its obviously not doing anything for this problem. First thing in January ( when I've got the money) I'll have someone qualified take a good look at that furnace fan.