don't mean to retread stuff, but i need some help with this saturn modchip...

[Comradericardo]

I got a saturn modchip from racketboy today, and installed it as the guide on the website said, i bridged a+b together and soldered the wire to the 5v plug on the power supply, set the system up with a regular game and it will not load at all. The disc drive is completely still, and the cd player shows a yellow sphere on the lefthand side and a green cube on the right with the standard 'reading disc' message. I've tried reinstalling it, filing down the chip, connecting it to the 32-pin chip. One of my saturns has bit the dust too, it just won't work anymore despit everything i do. Luckily i have a spare, and the modchip doesnt work on it either, despite everything I try. I get the exact same problem, but when i remove the chip, it works as normal, I hope someone can help me, i'm worried that the chip itself is broken somehow...