Speakers and DVD player


Hey everyone,
I'm using an iBook 500 DVD and just upgraded to 10.1
The only problem I've had so far concerns the DVD player. Whenever I have my external speakers (UMAX) hooked into the A/V port, the player tries to export video through the speakers. The sound works great, but there is no video on the screen. When I unhook the speakers, the app freezes and won't quit.
I've tried the A/V cables and hooked the comp. to the TV and it works perfectly.
Does anyone know what is happening and if there's a fix?
Thanks! :D