Getting a warning everytime i connect a cable to the usb port saying it is drawing to much power from computer with it being connected to any device

cannot connect i phone 5 or nano to usb port without warnig message appear say device is drawing to much power without a device connect to the cable

@Steve359 Wonder if you can help???
We have a Bretford iPad charging station (10 iPads, 30 Pin) when it's plugged into the iMac it charges and syncs all 10 iPads Just fine. We've since picked up 10 more iPads (lightening). This time we bought a Satechi 12 Port USB Hub with Power Adapter & 2 Control Switches (self powered) with wall current in an effort to save about $970 for another Bretford.
We have tried daisy chaining the Bretford and the Hub and get the Too much power error, We have tried plugging in 10 iPads with just the hub plugged in, works fine until we plug in the Bretford, then error msg appears. (both hub and charging station plugged directly into the iMac) We tried same setup with 10 on the charging station and with the hub plugged in began adding iPad to the self powered hub and get to 13 or 14 and then we get the error. Both devices are supposed to be self powered, both plugged into the wall power, both plugged into the iMac (not Daisy chained). Both Usb cords to the Bretford and the Satechi hub are in pristine condition. The 10 iPads in the Bretford are 30 pin and the Hub are the new Lightening connections. Lightening cables are the ones supplied new with the iPads.
iMac running 10.8
Any idea at all how to make this work??
signed: "Now bald because of ripping my hair out"
Thanx
Link to hub and specs:
http://www.amazon.com/gp/product/B0051PGX2I/ref=oh_details_o00_s00_i00?ie=UTF8&p sc=1

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Getting a warning everytime i connect a cable to the usb port saying it is drawing to much power from computer with it being connected to any device

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