Gamecube motherboard will not boot

I am in possession of a Gamecube that will not boot. Power supply and disc drive work great, when combined with other motherboards. Logical reasoning to assume it's the motherboard? If so, does anyone have some advise, for things to check first? Any voltages I can look at or fuses / resistors that I can look for?

Thanks

 

Check this out: http://www.gc-forever.com/forums/viewtopic.php?t=665

It gives output of pins and such you can test and you check and make sure everything is receiving power normally and is grounded.

 

I've seen GC boards that fried some important chip (either the Gecko PPC CPU, the Flipper or one of the RAMs) and they actually power on but stay into a solid black screen. Also I've seen boards where the Flipper chip shorted down, making it attempt to power on but shuts down: power led just blinks on then it stays off regardless of power button state.

If you tested the DC/DC power converter board and it seems good, very likely a major IC is blown on the GC board.