Did you use only one sd-card or did you try more of them? I think I tried more then ten cards and half of them failed on loading sneek. Even a 8 gb SDHC-card from Kingston gives only blue flashing tree lights on me. And now I'm using Pune's mod with a white brand card for the bin file, bootmii folder and the homebrew apps folder (It has only SD and 2 gb printed on the front) and it never failed to boot.