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yes they are .. on the monitor i have fixed one cap had almost popped and there are bulges in 3 caps on the other monitor so they were easy to spot.A bad cap can certainly cause humming.
These are aluminum electrolytics, right? Metal cylinder with a plastic sleeve? Was the safety vent (a couple of scored lines on the end) popped .open?
Main thing is just to get a low-esr replacement if it's the switching regulator. Try DigiKey or Mouser, they have nice abilities to sort through huge numbers of different caps by size, voltage, esr, etc.