I have a Logitech MK700 Wireless USB Keyboard & Mouse Combo and it works just fine with the USB receiver in my Macbook Pro. But recently, I purchased a 2010 27" 
iMac and I inserted the USB Logitech Receiver in the back of the iMac in one of the 4 USB ports, but it didn't recognize the device. However, when I plugged in a USB 3-port Hub, and inserted the Logitech Receiver, and it worked perfectly! My question is...
How come my iMac doesn't recognize my wireless Keyboard/Mouse USB, but my USB Hub does?
(BTW: On my Windows 7 partition, the USB Receiver works just fine inserted into the back of the iMac.)
iMac and I inserted the USB Logitech Receiver in the back of the iMac in one of the 4 USB ports, but it didn't recognize the device. However, when I plugged in a USB 3-port Hub, and inserted the Logitech Receiver, and it worked perfectly! My question is...How come my iMac doesn't recognize my wireless Keyboard/Mouse USB, but my USB Hub does?
(BTW: On my Windows 7 partition, the USB Receiver works just fine inserted into the back of the iMac.)