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May well be simply that the other devices on the hub are drawing all the current that the computer's USB port it is connected to can supply.
Try either digging out the Hubs power supply (I don't use mine , I can get buy without it) and connecting the hub to the power adapter so it has it's own source of current which is independent of the USB port you are trying to drive it off.
OR
Remove one of the unpowered devices you have connected to the other 3 USB ports on the hub , and then reconnect the camera's USB cable to the hub.
BTW I often find the same problem with I connect the printer to the hub .
Removing a device from one of the hub's USB ports fixes the problem.
Hope that helps.
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