Monitor clicks, pops, or makes other noises
Noise when turned on or off
It is normal for standard computer CRT monitors to make a click, pop, crackle, hum, buzz, or other noises when they are first turned on or turned off.
Noise when monitor goes into standby mode
When the monitor enters a "standby mode" or "power savings mode," this is similar to the monitor being turned off. It is completely normal for the monitor to make a noise when the monitor enters this mode.
Noise when opening Windows, other operating system, or when opening a game
When a computer opens its operating system, (e.g., Microsoft Windows) or when you run a computer game the monitor may need to switch its resolution. When switching resolutions, it is normal for the computer monitor to make a noise and flick or flash.
Noise during normal operation
If the computer monitor click, pops, or flashes while it is being used this is not normal operation. It is very likely that the monitor may be failing, or a component in the monitor has already failed and could also potentially be a fire hazard. We highly recommend that the monitor be repaired, replaced, and looked at by a qualified technician.