Just thought I'd add something I've found to this thread
My WKF that I killed:
Well i got it displaying the GC-Linux screen, but that was it. Black screen when trying to boot it. The FFC to the SD card ended up being faulty, and I had long power and earth leads. Sent to another member for price of postage.
My last wasp fusion: it would give errors randomly on certain games (well metroid 1 and 2) usually within a minute of getting into gameplay, other times earlier. I shortened the earth and power leads. Perfect. Has never failed me. I have used it heaps. Autoboots swiss on my sandisk ultra (one of the 5 sd cards I have) BUT when I started using this card I would get random freezing, until I changed from 32mhz down to 16mhz in swiss. Wierd.
Current WIP with wasp fusion: Works flawlessly with default menu, the blue LED doesn't illuminate until I tell it to (Pin 29). With swiss flashed it sometimes works first go, other times the blue LED stays illuminated, other times it gives a read error straight away with the autoboot SD card in.
I have tried two wasp SD slots (I used the WKF SD slot with my last wasp) and also two ffc cables to sd card (I repaired the other) I have the power and earth cables are less than 3cm short! wiring has been checked over 1000 times! have tried alternate power and earth points.
The only difference is custom regulators and a cut board, but I have only moved the connections further along the trace to the safe cut alt. points.
The gamecube was purchased faulty (disc drive didnt' spin) but I don't think that would matter at all.
I am just going to live with the fact I have to restart it a maximum of 3 times until it works sometimes.. and other times it works first go. When it works.. IT WORKS... no problems what so ever! Very strange.