I'd look and listen to the fan(s) yourself and see if it seems like it's normal. The message could means the power supply fan or other fans on the case (like an inlet on the front). If the message is repeated, I'd be a little concerned. It could mean something like a fan is supposed to be rotating at a certain speed, and it's now slower, which could be a warning sign of a future failure. Bad news to have a fan go completely dead, especially if you have only one fan for chassis cooling...that can bake your CPU and memory beyond repair. There are also fans on CPUs and some graphics cards, but if air isn't flowing through the case, those fans will only help for a while.
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