Hi, Can anyone tell me if the Bauer A512 only actually starts the filming mechanism with a cartridge inside? I picked up one of these for quite cheap and it looks to be in decent shape, popped in 6 fresh AA batteries, set the top switch to indicate the power to show the green dot, pressed the trigger and...nothing happens. And if it is supposed to start up without a cartridge, any ideas as to what's causing the problem? The contacts of the battery compartment seem clean to me. Thx!