EMac screen shaking

Hi
Well recently my family and I moved into an older, but larger house and suddenly my eMac has been having a strange problem. The screen is shaking badly on both sides of the screen and there is no magnetic device around it at all to cause it. However, sometimes it is very bad, while other times it is barely shaking at all. Does anyone know what could be causing this? If there is a problem what should I do?
Thanks in advance
~Joe~

Continuing the above post after being called away: two-prong also means non-polarized outlets. It's possible to replace such outlet receptacles with three-prong polaraized outlets, but to do any good, the outlet boxes need to be grounded and the hot and neutral wires correctly identified. You can check how difficult that will be by shutting off power to one branch circuit and removing a two-prong outlet. If the metal receptacle box has a copper ground wire attached to it, that can be pigtailed to the ground terminal on a replacement plug. The power feed lines under the current building code would be black=hot, white=neutral. If all the pieces are in place, replacing all the outlets in a house is straightforward but tedious (I've done that last part in a house where the previous owners thought it would be a good idea to use a spray gun to paint the interior wall. ceilings, and trim all the same color). With an older house, the power wires could be some other colors, or worse, the colors don't necessarily match the current code. An experienced electrician can test and identify the wiring and add grounding wires if necessary.
Be aware that grounding adapters don't necessarily provide a ground path even if you remember to run the cover plate screw through the adapter's screw plate; that only works if the outlet box is grounded.
You should also look at the circuit breaker for the house (given it's age and the outlet types, it's likely a fuse box instead of a breaker box). What amp rating is on the breakers or fuses? Older 10-amp service lines would be overloaded in a typical house, where the once-standard 15-amp service is increasingly being replaced by 20-amp to handle the demand for electronics. Low amp ratings make it more likely that heavily loaded lines are carrying more electrical noise; that noise can affect the eMac display both through direct transmission into the eMac's power supply and by RFI rediated from lines inside nearby walls.
An Uninterruptible Power Supply (UPS) with line filtering could improve the screen stability on the eMac. Lower-capacity APC models (e.g. the 350mA BackUPS model) are commonly used as loss-leaders to get people into the computer stores in my area and can be found for US$40 or so.
Good Luck!

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