Every once in a while, the image on my monitor begins to vibrate or shake. After a few minutes it stops. Any idea what could be going on?
Check the position of your monitor—especially if it is near the wall of your kitchen. Author Sandee Cohen tells us that one of her staff had a monitor that would begin to vibrate every time she heated up her dinner in the microwave oven, which was on the other side of a very thick wall. Microwave ovens can generate electromagnetic disturbances that can cause your monitor screen to vibrate or shake. Similar disturbances can happen near large power transformers, and in basements that are over subway lines. In challenged locations, a flat-panel LCD display (which is much less susceptible to electromagnetic interference) might be the best choice.
How do I connect my old Apple monitor to my new Mac? [9 & X]
For the first ten years, Apple used a DB-15 connector with two rows of pins to connect external monitors. If you have one of these monitors, there is a cheap Mac to VGA adapter that converts to the industry standard VGA connector, which has three rows of pins. New Macs have had VGA connectors for several years now.
How do I connect my new non-Apple monitor to my old Mac? [9 & X]
Most industry standard monitors use the VGA connector with three rows of pins. That fits right into new Macs, but for older Macs, there is an inexpensive MacPNP adapter.
How come my new non-Apple flat panel won't attach to my new Mac? ...