I have been using my Nook Color as an Android tablet (using an SD card w/CyanogenMod 7) for a long time now, but just recently it stopped booting as an Android. I can see the boot screen just fine, and if I choose to boot it as a Nook, it works just fine. Unfortunately, however, when I try to boot as an Android, I just get a bright flash - like it's about to start booting - and then nothing. I've left it sitting for over an hour, but it never showed anything but a blank screen. Any suggestions?