Electrical signal distorting monitor?

[halve]

Well last night I went around plugging my monitor into different outlets and I discovered this. In my bedroom it is visibly the most shaky, When I move it out into the hallway about 10 ft or less away, it shakes less. When I get 20 ft away it may not shake at all, if it does shake it is very very small. I havnt a clue about what is causing it, I dont think it is the outlets because I ran a extension cable from the outlet that was 20 ft away. When it is in my bedroom with the extension cable it is very shaky, when it moves out it gets less and less shaky. In my room I dont have to much electrical equipment, a tv, vcr, xbox, a elctric shaver and a alarm clock. These are all atleast 5+ ft away from where the pc sits, and non plug into that outlet. So what would you guys and gals try next?

Thank you very much for all your help

Halve

 

[Mavrick007]

I'm thinking that there's either some big magnetic source in your room (Note: unshielded Speakers), or the wiring in your walls really sucks. Maybe it's the people next door trying to pull an asteroid down with a super electro-magnet

I'm thinking that there's some disturbance in your room. Paranormal? Possibly. Whatever the case, it's causing bad karma.

 

[powerMarkymark]

Have you tried using different refresh rates? That's how I fixed my problems.

 

[arcas]

Are there any large AC motors in use near your bedroom, say an attic fan or furnace or air conditioner? Have you tried different locations in your room? Also, try rotating the monitor and see if the distortion varies. Another thing to consider is the room wiring. I'll explain:

There is one room in my house, a bonus room with sloped ceilings, where I'll get EMI if I locate my 22" monitor near one wall in particular. There are no motors in the vicinity. If I run everything on UPS battery power, I get no distortion. If I plug anything that draws, say, more than 100W from the outlets along that wall, the monitor will start to shake even if it itself is still running on battery power. The distortion increases as the power use increases -- a 300W light causes more distortion than a 100W light.

The only thing I can figure is that side of the room was wired in such a way that the Romex rests on or very near the sloped part of the ceiling before going down the wall to each outlet (this part of the ceiling meets the wall about 4.5 feet off the ground so it's relatively close to the monitor when sitting on a desk). Thus, when those outlets are in use, current flows and an oscillating magnetic field is created along that entire length of wall/ceiling and this is what is interfering with that monitor. That part of the attic is walled off so I cannot get back there to verify my suspicions.