Hi Geoff. Welcome to justanswer.
Have you tried changing the ports?
When you connect the camera, do you hear any sound?
Do you have any other device or computer to check if the fault is with the usb cable?
Have you turned the dial of the camcorder to PC mode before connecting it to your Macbook?
You need MotionDV STUDIO in your system. Do you have it installed?
I also checked at my end. The software is not compatible with Mac OSX. So the only way you can transfer is via sd card.
GS400 is a mini-DV camcorder, you need to use FireWire to transfer your video, not USB. Do you have it?
You need this kind of wire to transfer directly without any software.
Check the attached image
Sure Geoff. You can buy it from here.
CLICK HERE TO BUY
The GS400 ( and indeed all MiniDV camcorders) have firewire. It looks like small USB and may be called Dv out or i-link ect but it does have one Behind the baterry compartment?
Buy from the link which I provided above. Your problem will be resolved then
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I am sorry that Amazon sent you a wrong cable. But the solution I provided was the only way to connect your camcorder.