Okay, here's the deal: the Viper is installed properly, and the Cobra BIOS boots just fine. Originals still work fine, but neither disc swap mode nor direct boot mode even remotely attemps to work for DVD-Rs. This is my second install, where the first one worked beautifully, and direct boot mode works like a charm on that one. But here, the Gamecube keeps trying to read the barcode and what-not from the DVD-R, and just struggles for a while and then gives up (the laser is focused pretty far inside the area where the data actually begins, so it's not the media; besides, I'm using G04s). I've completely removed and reinstalled the chip, and I've gotten the same result. Any ideas?