using iMac 5K OS 10.10.3
When there are no USB devices connected to iMac, it keeps showing this.
I tried SMC resetting, booting through Safe Mode, and nothing is working to make this alert go away.
Has anyone had the same experience?
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MacBook Pro (Retina, Mid 2012) 2.6 GHz Intel Core i7 8 GB 1600 MHz DDR3
I just want to say I have the same problem, and Apple Store says it is indeed a hardware problem (and quite pricey to fix).
One USB port never works now, the other one is on and off - that message just pops up now and then.
Solution: If it becomes worse, I will get a thunderbolt->USB adaptor.