What would cause the power to the monitor to be unstable?

What would cause the power to the monitor to be unstable? I got this HX2000 used a few years ago, so I do not know the history of the unit prior to me getting it. That being said it has been working very well so I do not think the monitor is in bad shape internally. However, I set it aside because 900p has largely fallen out of favor and can be difficult to live with. I have pulled it out of storage because I have plans to use it for a few projects I am working on. Anyway, this monitor has 2 different issues:

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mcgyver89 [Entry]

"From your pictures I'm afraid I'm having difficulty seeing what the problem is.

You can't reliably assume an electrolytic capacitor is good if it shows no signs of swelling or leakage. It's worth getting a cheap component tester - you can get a bare-board on from the Far East for under £5. Only a couple of weeks ago I had to replace 3 electrolytics in a sound mixer which looked just fine, but one read half its rated capacitance with 11% loss and the other two were open circuit."