What brand monitor is out fitted with electrolitic capacitors that have a long life span. Depending on heat you can only expect
5000 hours of life from capacitors in the monitor Power Supply.
They eventually will blow and leak fluid and dry up and become Effective Series Resistance with a too high value.
An open and it takes more than one to make your screen black. First annoying flickering problems and then other off and on problems until you have 4 or 5 blown capacitors and it will not power up.
Only a 2 year expected life from an expensive monitor, unless you want to open it and solder in a few capacitors that will give it another 2 or so years of use.