Macbook Pro and USB HUB

Let me start with this. My Macbook Pro (4 yrs old) has only 2 usb ports, so I went to buy a USB HUB. I bought Pentagram HUB USB 4P Passive [P 1224-3] , I plug it in. Small green light on it is on. Then I plug the printer, wireless mouse receiver and a WD Passport 160GB. None of the above are working. (The printer has it's own power cable). Where's the problem. Is it the HUB or something else?
Please help.

It's the hub. "Passive" is the key to your problem.
An "active" or "powered" hub prevents devices from drawing more power than the ports can deliver. Your big consumer is the WD passport drive. You're powering not only the electronics but also an electric motor.
If you mainly need the hub for working in a home or office environment, always go for the powered type. The passive hub may work for travel as long as you limit the number of devices.

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