Mac pro left USB port can't connect to iPad

Hi,
I just got my new Mac Pro days ago and I really love this new gift, except that when I plug in my ipad air to the left USB port, it gets connected then disconnect instantly after a few seconds, then detected... This happnes over and over. I tried different cables, it sill doesn't work. But for my iphone 4, which requires a different kind of calbe, it works fine. I think it is the problem with my Mac.
Does anyone have the same problem? Can I change my Mac with a new one? Thanks!
KnightCross

Take it in for warranty service.
Barry

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1. Used iPad 3 until I have run battery down to about 50%
2. Plug in to left USB port on Late 2013 rMBP. Battery icon starts displaying "flip-flop" behavior.
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Mac Pro 2008 USB port problems - persistent

Hello all,
I have a 2008 Mac Pro - standard config : 2.8Ghz 2Go Ram ATI 2600.
At the outset I did a clean install onto a 1To Seagate drive.
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sites.
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PA
P.S. My first Mac was a MAC SE !!

I think there is a problem with the usb ports on the MacPro which I also think is causing some of the bluetooth problems that are being reported around. Here's why.
I have a "base" new MacPro (2xQuad 2.8, 320G drive, etc.). After getting the unit going with the standard usb keyboard and mouse I then paired my Apple wireless keyboard and mighty mouse. All worked fine. Then the problems started. I have security set that requires a log in when booting, however after restarting, or rebooting, the MacPro the wireless keyboard and mouse were no longer recognized and I was stuck at the login screen. If I then connected my original Mac usb keyboard it would not work. The ONLY way I can get the usb keyboard to work is by having it connected when I reboot/restart. Calling Apple support was...well let's just say less than useless. So I have been doing a lot of experimenting on my own. I have finally found out that if I have nothing at all connected to any of the usb ports then the MacPro will recognize my wireless keyboard and mouse (although it does take some time to recognize it). If I connect my usb devices again and reboot...back to the same situation. No connection to my bluetooth devices and my usb keyboard will not work (unless I again reboot with it already attached). Now before you say it's my other usb devices let me tell you what I have....just a Canon printer and a Western Digital USB drive that I use for Time Machine. Both of these units have been working fine for over a year and work absolutely fine when connected to my Mac Book Pro.
I believe the bluetooth device inside is connected to the usb bus internally which is why I think the usb bus is the "root" of the problem. When certain usb devices (and heck it my be almost any usb device) are attached then the usb internal hardware screws up, which kills the bluetooth connection. I believe that this problem may be borderline (not sure if its power, timing, etc.) which is why we see so many issues that are similar, but hard to pin down.
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MAC PRO Internal USB ports stopped working

Hello, I have a mac pro 8 core with an USB internal ports problem, the 2 in front are not working anymore, and from the 3 in the back only the middle one is working.
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MacBook Pro (Retina, 15-inch, Late 2013) : Constantly disconnected and reconnected from my iPhone while using the left USB port. Is this a rare accident?

If the iPhone works correctly on the other port, then the fault lies within the MBP. Bring it in for service.
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USB-Hub not working on LEFT USB port?

Hello,
I have installed Windows 7 Ultimate 64 Bit on my MacBook Pro 13" Retina (Early 2013) and it's running fine. Boot Camp version: 5.0.5033.
But I have one problem: I bought an external monitor (Dell U2414H) which has an built-in 4-Port USB 3.0 hub. So I connect the Dell monitor using a DisplayPort 1.2a cable and an USB 3.0 cable. But Windows only recognizes the monitor's built-in USB hub when I plug the USB cable into the right USB port (when I sit in front of the MacBook). Then it works without problems. But when I plug the USB cable into the left USB port of the MacBook Windows only says "USB device not recognized". But other devices like USB sticks and USB drives also work without problems on left and right USB port of the MacBook. Also when I boot in OS 10.9 Mavericks the monitor's USB hub is working on both USB ports of the MacBook. So I think it isn't a hardware failure. I also re-installed Windows, but I have still the same problem.
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I think I've hit a variation on the problem you're enoucntering. I have a late-2013 13-inch Macbook Pro Retina. I've just installed Boot Camp and a copy of Windows 7 Pro. This is my first experience with Boot Camp and Windows on a Mac, so I'm in foreign teritory.
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Left USB-Port dead after wake from sleep. Just restart helps.

I hoped Apples keyboard-Update today would solve my biggest hate-bug in this buggy POS called Leopard. It didn't.
As usual on my Leopard-Macbook Pro, no device will work on the left USB-Port after I waked the computer from sleep. Just a restart helps. I hoped this update to solve this, because it replaced among others "IOUSBFamily.kext".
Terminal gives a timeout error for the internal USB-Hub after wake from sleep. I assumed this should be related.
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Was 10.5.1 just smoke and mirrors to make (fool people into...) people upgrade who intended to wait until the first maintenance-update?
Was Leopard Apples attempt to make Windows-Users more comfortable by putting in some heavy extra-bugs and blue screens?
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Apple knows the problem and for some reason they are stumped on fixing it. this is so bad I can't believe it. On my macbook pro with Leopard installed, USB left port is dead after sleep. Only restarting can power it back up. I have to restart every day to use my external hard drive for time machine or when putting my flash drive in the port.
Come on already Apple. This is a SERIOUS, SERIOUS problem.
Fix it.

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External USB2 drive doesn't work on left USB port

Hi,
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Try resetting the PRAM:
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