Philips 240B4 User Manual page 45

In most cases, the "burned in" or
"atter-imaging" or "ghost imaging" will
disappear gradually over a period of
time after the power has been switched
off.
Always activate a moving screen saver
program when you leave your monitor
unattended.
Always activate a periodic screen
refresh application if your LCD monitor
will display unchanging static content.
Failure to activate a screen saver, or a periodic
screen refresh application may result in severe
"burn-in" or "after-image" or "ghost image"
symptoms that will not disappear and cannot be
repaired. The damage mentioned above is not
covered under your warranty.
Your LCD monitor works best at its
native resolution of 1920 x 1200 @
60 Hz. For best display, please use this
resolution.
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