I just had an LCD monitor fail on me today and it was eleven years old. What let it down was an internal power supply, which, unless i'm prepared to take it apart and chase around for parts, is now a dead unit. What a shame, it was a decent monitor and i'm sure would still work. I never thought about it being an internal power unit when it was acquired all that time ago, although i'll consider that in future.
It'll be off to the recycling.
All of the other monitors here have the external power brick, which makes it much easier to resolve a PSU problem.
What sort of life are you getting from your monitors? Perhaps you've even still got CRT monitors running?