Spontaneous degaussing while I´m working

Spontaneous degaussing while I´m working.
As far as I know degaussing happens everytime
I turn on the eMac.
But from time to time mine makes a noise
similar to a magnetic turn off (like when
you turn on the home TV), and display
diminished in voltage, (I suppose),
and then everything is normal again.
It happens when I´m working and some days ago
just five minutes after turning on,
the thing occurred two times in less than two minutes.
Any help, please?
Thanks in advance.

That doesn't sound good, I'm afraid. Is there any evidence that other electric devices nearby are also displaying evidence of briefly diminished power/brightness? If the root cause is a noisy power line feed to your place, an Uninterruptible Power Supply (e.g., BackUPS line from APC) would smooth out voltage fluctuations. I don't know if the Apple Hardware Test display test would pick up any degradation in the degaussing circuitry, although that seems unlikely.

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