Try Just Switching The Disk Trays
Some May Be Not Hotswappable
Just Switch The Trays Inbetween The Xboxes

XenUnknown wrote but is there anything else it could be

nope u will have to try a new brand Did this help?

well it just might not workin ur xboxbut might work in his if does pm me if i get code

TTG-MaTTriX wrote Try Just Switching The Disk Trays
Some May Be Not Hotswappable
Just Switch The Trays Inbetween The Xboxes

yoant cause u need the same dvd drive brand and switch motherboards he said his disks r reading fine anyway so its not a dvd drive problem

Here Is WHat You Do Boot up the retail version of cod5 On the xbox that is "Unhotswapable". Then go to XBoxLive Take THe retail Off THen Put the modded iso it should start spinning go back to zombies and it will be modded with what ever is on your Iso.

Massachusettts wrote Here Is WHat You Do Boot up the retail version of cod5 On the xbox that is "Unhotswapable". Then go to XBoxLive Take THe retail Off THen Put the modded iso it should start spinning go back to zombies and it will be modded with what ever is on your Iso.

if its unhotswappable it probs wont work if u do that

so what u gonna do then? did i help at all?