EDIT: looking again I can't tell if the light is amber or red, its about the same color as the gamecube light. does it stay amber after the first flash? i'm assuming it's working because I can play backup disks that wouldn't load before.
EDIT 2: A bit more info, It's a wired install on the primary xenoGC spots, just soldering wires to the board then sliding the board on and soldering the wires to the board. Here's a photo, it's not pretty, but I'm not sure what I did wrong. If I need to de-and re-solder it I will, but want to make sure it's not something simple I'm overlooking first.