Cant connect my ios devices to my mac book air

I cant connect my IOS devices (iphone 4s + ipad 2) to my macbook air mid/2013 by usb or bluetooth.
when connecting by usb the devices dose not charge or sync with itunes. it charges for split a second and disconnect anther time and it go forever in the his loop.
I tried using two cables.
The devices are working on my windows pc.
my macbook works with usb sticks and other android phones.
note:
-both devices are on ios 8.1
-my macbook is on Yosemite
-my ipad 2 worked well before updating my mac to yosemite

iPods that have the Window format should continue to work on a Mac, because Macs can read/write the Windows format used on iPods. (The opposite is not true - Windows cannot read the Mac format.)
You can change the formatting, by doing a Restore on the iPod, but that is done in iTunes, so iTunes needs to see the iPod when you connect it. The Restore will also erase the iPod.
Since it continues to work on your friends Windows PC, your iPod itself is probably OK, so you may want to first look at the connection to the Mac.
Did you use the same USB docking cable when you connected it to your friend's PC? If so, you can rule out the USB cable as the cause. If not, it's possible that your USB cable is faulty.
If you are connecting the iPod to a USB hub, try a direct connection to the Mac's USB port. If other USB devices are connected at the same time, try disconnecting the other devices (except for standard keyboard and mouse if normally used). You may also want to shut down (power off) the Mac, if you have not done so in a while. Also, do this to Reset the iPod
http://support.apple.com/kb/ht1320
Start up the Mac, run iTunes, and connect the iPod by itself to a direct USB port.

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Cant connect my ios devices to my mac book air

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