Tripp Lite power supply goes “Thump”

So, I’ve got this Tripp Lite 25 Amp power supply that I put in storage a month or two ago ahead of Hurricane Matthew (along with a bunch of other radio gear). I just got around to setting it back up, and it appears to work fine, except that when I flip the power switch, the supply makes a metallic “thump” sound.

I toggled the switch a few times, the thump happened almost every time. I couldn’t find anything else wrong with it, just curious if this is a problem I need to be concerned about.

submitted by /u/Raguleader
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