okay sam serious i am begining to think the dvd player is at fault. Okay here is how we are going to test. We are going to make a cable that you can plug into the monitors as aux input 2. The pinout for the bmw cable is kinda of reversed.. you will need a 3 ring headphone connector.. and like pigtails to connect to rca.. this adapter from bmw cost 21 bucks.. not sure why.
okay the pinouts for the bmw are just like this webpage

Getting Video out of an Apple iPod with a standard Audio Video RCA Cable - Scott Hanselman

• Tip - Left Channel white signal
• First Ring - Video yellow signal
• Second Ring - Ground all grounds
• Ring closest to the cable - Right Channel red cable

if you look on this webpage it also tells you what the ipod uses. so then you can make and adapter to work with IPOD.

Again this is just to verify that the monitors are good and possibly the dvd is hosed.

this is what i use to give you and idea of what it looks like
http://img102.exs.cx/img102/357/p10100141ng.jpg

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E53 06 3.0i

wishlist
Comfort Seats
speckdock 2.5

Mods
Air suspension - wip
skid plate replica - in box
OEM sunroof deflector
OEM bluetooth streaming
navi,dsp,tv retrofit - wip
Low prof roof racks
2 directtv satelite tuners
Grom audio usb2
quarter and back window sunshades
2 10"subs- boxes opposite sides/Alp MRP-M850
rear heated seats retrofit
rear footwell lights retrofit
remote window roll up