USB Hub does not work

i have an iMac (mid 2011) bought on september 2011.

I bought a USB hub (this one http://www.trust.com/products/product.aspx?artnr=15140) and i have many Problems with my iMac.

I have made a SMC reset bit still doesn't work. I have tried thi shub on a MacBook pro of a friend and there it works. On a windows PC it works too.

Onli on my iMac it doesn't work. It does not recognize the Hard drives. USB stick formatted in exFAT, USB stick formatted in NTSF (with Paragon NTFS) USB hard drive formatted in NTFS... it recognise none of these devices.

Onli the USB receiver of my Logitech mouse.

All Devies works nice if i plug them directly to a iMac USB port.

Can anyone help me? I have tried all possibilities and help found on google and also here 🙂

Kind Regards

Stefano Michienzi