I have two SD cards both 8GB. The one I put CM9 on it last night and it was working fine. Then I used another 8GB card to put on CM7 since CM9 was quite working right. I would freeze on my every so often. Now, neither card will boot. I can hold the power button forever and my nook will not turn on. My regular SD card is a 32 GB and that one works though now for some reason I have to hold the nook button down along with the power button for it to come on, I never had to before. I am not sure what happened, but I was wondering if anyone has ever had a similar problem.