Hi, my sister in law bought an imac with an i3 cpu and I went and hooked it up for her the other day with a few usb cables and she called me today saying something like she has to remove some usb port cables because its pulling to much through the ports ! she only has I think 3 ports connected ! I have a macbook pro and never heard of this issue, has anyone heard of this I'm not close by and can't see what's going on so I can't give all info on this yet.