hi i've prepared two mp 3.1 for a client, 2.8GHZ 32Go ram ssd, +sapphire radeon 280 model power connector 2x 6pin, mac efi rom made by netkas script, cinema display with dvi, but i find out some power cable issue: when i plug in one 666Y cable - mini 6pin to 2x 6 pin, the mac will not start, it...