IMac 2012 OS's not loading while USB-Hub pugged in. Why?

So i have a problem. I have a new iMac 21,5. I plugged in my iMac through my Smart-UPS and It has an USB control. SO i turn to iMac USB-Hub with 3 USB and card reader in it and to this USB-Hub i have connect USB cable going from Smart-UPS.
When i turning on my iMac its stop loading and i see white screen which goes before screen with Apple logo. As soon as i remove USB cable USB-Hub from iMac its going loading good and then i connect USB-Hub again and it works well. Why it can happen?

ok just did it.
So right now all USB prots on iMac are busy.
- USB Wacom Wirless connection kit
- USB-Hub with cardreader
- UPS directly to iMac
- Wacom tablet.
Turn on iMac and system starting and loading quick
SO looks like trouble was that i had connect UPS through the USB-Hub? Why it could be? Just early when i have this connection of UPS through USB-Hub i notfied that in task bar(or how it called on iMac where clock, menu at the top) there are icon with power pluged to UPS showinig percentage of battery loaded. And sometime its appear and then disappear and jumping here and there. Now when it connected directly i see this icons always appeared.
So it looks like it lost connection sometime and this USB-Hub only for turning usb flash, some low power stuff and memry sticks only?

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