Macintosh II Family: Monitor Noise at Startup is Normal



Many Macintosh II monitors make a loud noise when powering up. The
high-resolution monochrome and color models seem to make this noise
consistently. Is there a problem with these monitors, or is this just a
characteristic of the monitor?

The sound that you hear is the degausing coil being activated on power-up.
Color monitors are subject to impurities from other magnetic fields. This
is countered by putting a neutralizing field around the front of the CRT on
power-up or by pressing the degausing coil button on the back of the
monitor.

The sound is simply the coil energizing and is in no way a sign of current
or future problems.


Published Date: Feb 18, 2012