Well to start, I have the USB extension cord connected directly to my computer. Then I have the 'video capture USB' connected to the extension and the different colored cords attached to this, which were plugged into the front of the tv into the corresponding yellow, white, and red portals. These were initially attached to the back of the tv, but when this didn't work I moved them to the front with the same result. I can't find an S-whatever cord right now, but I hate to buy one if I'm going to get the same result. One more thing, does it matter that this is a TV with a built-in VCR? I tried on an external VCR with the same result.
Here are my MacBook specs:
Mac OS X 10.5.8
Processor: 2.4 GHz Intel Core 2 Duo
Memory: 2 GB 667 MHz DDR2 SDRAM