I had the same problem with the black screen when trying to install different roms on mine. I just kept clicking the power button and after a few minutes it would kick back on every time.
There is an entire thread specifically on this
Do I need to have it plugged in to my computer? or did you mean plug in the SD card?
Do all that then plug the sd car into Nook I mean.
I've tried several different guides, and bounced around from several different image writing programs. Although I feel i've followed these instructions, my brand new Nook Color with 1.4.2 already on there seems to ignore everything and not give m...