How long does it take to replace a computer monitor?
Replacing a computer monitor should take less than 10 minutes.
First shut off the computer. Unscrew and unplug the (blue or white)
video cable for the monitor from the back of the computer, and
unplug the monitor power cable. Then remove the old monitor from
the desk, replace with the new monitor, and plug it into the video
and power plugs. Start your computer and once it has started,
adjust the resolution and refresh rate to match the specifications
for your monitor.