Executer 2 problem

[PompeyStu]

I have recently purchased the Executer 2 modchip and i am having a few problems.
I have soldered all of the relevent wires into the correct points but when i apply the actual executer 2 chip the x-box fails to boot. It makes a strange beeping noise and has no picture. When i remove the executer 2 chip the x-box boots fine.
I have tried the chip with the jumper both on and off and it has the same effect.
Anyone have any ideas?