Having problems connecting things to both usb ports at same time

I'm trying to connect both Serato Scratch and an audio interface into each of the usb ports on my powerbook, but i'm having problems. Serato will register when plugged into either of the usb ports, but as soon as i plug my audio interface into the other socket, Serato instantly loses the connection. As soon as unplug plug the interface, Serato instantly registers again.
Is this likely to be a mac problem? Should i be able to have both usb ports connected to and both things registering?
This is driving me crazy. Any help is greatly appreciated!

It's known that Powerbooks don't put out alot of electrical juice onto the USB ports. If both devices are relying on power from the USB ports, that may be the issue. If so, solution is to get a powered USB hub, or if the devices will support their own power supply, get one.

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