the LCD should last "forever", the other parts......
the LCD panel inside of your monitor is the expensive part, and it will last "forever".
However, other parts of the system will limit the lifetime.
The cold cathode florescent tubes used for a backlight will have a 1/2 brightness time of a few thousand hours and may suffer premature death.
The power supply parts should last forever, but may also suffer failure after a few years (especially the surface-mount capacitors for some reason).
Buttons - well that depends on you. Same for rear-panel connectors (don't stress them).
Unlike a CRT monitor where the tube is about 95% the value of the monitor, and when the tube gets dim you chuck the whole thing, when an LCD gets dim, you can replace the lamps. This will take some effort, and your computer place WILL NOT DO THIS (they just REPLACE MAJOR PARTS) - you gotta find a real electronic technician who can use a mutimeter and a scope and stuff.
There are actually very few styles of lamp made, so you can track these down. You (or your tech) will have to get these from a major distrutor like Bulbtronics or Arrow or something. This is different from, say, TV's where some of the parts are custom chips and can only be obtained from the mfr (IF the can be had at all).
Overall, over the years, I have tossed CRT monitors about 1/2 the time because they were broken (either out, or degraded performance) and about 1/2 the time because nobody wanted to use it (too small, to low res). EVERY time I have discarded an LCD it was because it was too small or too low res (i.e. 12" VGA). The one exception was when my laptap display went out (under warranty) because of a $2 cable and they replaced the entire display (worth about $600). It was done under warranty and they would not give me the old one back, so maybe someone back at "depot" replaced those $2 cables and recycled the LCD panel....... Like when you get a new alternator for $120 and they take back the old one so somebody can replace the $2 brushes and then repaint it and sell it for $80 "remanufactured".
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