Emac display flickrs little

ever since i bought my mac 3 years ago everytime someone in the house nere my room plugs something in to a outlet and uses it or my brother turns his pc on my screen shakes, like a little flash? It does not bother me but i would like to know why?

A surge protector offers protection against overvoltage but does nothing about undervoltage (worse, most common inexpensive surge protectrs degrade overtime and will lose efffectiveness although the status LEDs will contunue to show everything is OK; high-quality surge protectors cost significantly more). Do you know if the surge protector you're currently using included power line noise filtering? (You can Google or post the make and model of the outlet if you're not sure.)
If possible, try moving hte eMac to a different branch circuit (you'll likely need to move it to another room) and see if you still notice the flickering. It may be just one particular circuit in your place is overloaded. Also try using a different surge protector or even temporarily running the eMac directly plugged into the wall long enought o determine if the flickering then stops (only try the direct plugin to the wall when there are no storms in the area!); if that helps, replace the surge protector. Tripp Lite Isobar surge outlets have impressive price tags but even more impressive performance; that's the standard at the lab where I work and there are Isobars still in use (and working condition!) after 10 to 15 years.
I need to retract what I wrote last night about line testers being available at places like RadioShack; that's true of phone line noise testers but not of power line voltage testers, which are nowhere near to being considered afforadable for the occasional home user.

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