using iMac 5K OS 10.10.3

When there are no USB devices connected to iMac, it keeps showing this. enter image description here

I tried SMC resetting, booting through Safe Mode, and nothing is working to make this alert go away.

Has anyone had the same experience?

  • could you turn off the Bluetooth, the Dropbox and that Truck ?
    – Ruskes
    May 3, 2015 at 21:17
  • Dropbox and the truck icon (Transmit) would in no way affect USB connections.
    – tubedogg
    May 3, 2015 at 21:20
  • turning off bluetooth will make no input devices available. dropbox and truck can get out of the bar, but it would not affect the issue to be solve. but I'm so desperate, give it a try. NOPE!
    – handicop
    May 3, 2015 at 21:24
  • 1
    @user24601 pram reset? i have to look it up and try. no, i havent't. thanks, i will try and get back here.
    – handicop
    May 3, 2015 at 23:15
  • 1
    @handicop Here are Apple's instructions.
    – user24601
    May 3, 2015 at 23:19

2 Answers 2

  1. None of apple technical support instructions worked.
  2. Called for Apple Care Service
  3. Technician came with a brand new mother board
  4. Replaced and problem fixed.

So basically it was hardware failure, which can't be answered here since the board was taken.


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.


You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .