After trying many SD cards, i finally got the brown box to appear by using the image that jichuan suggests in his troubleshooting section (post 131) and then erasing the files included with the image and copying over jichuan's files from his zip in method #2. Still no brown box until i put the sd card in and restored the nook to factory defaults (hold down power and n keys, releasing when n screen goes blank). The next time i turned on the device, the box appeared.
I can not believe my luck. I had purchased 2 brand new 8 Gig Color Nook Tablets (thanks to previous poster asking if these are Tablets and not the Nook Colors, they are the Tablets). All went perfect on the first Nook. I was rooted and did not have any problems with the unknown sources check box. Then I factory restored it as I thought I was going to be giving this to a family member and they did not want rooted. They changed their mind. So I went back and went through the exact same process on this first Tablet with the SAME 4 gig microdisk as I did the first time. This factory restored Nook will not brown box at all. I tried everything. Even reformatted the 4 gig disk all different ways. Formatted with the Nook, then formatted with Windows, then formatted with sd formatter program. This factory restored nook just does not want to be rerooted nor. Even tried a different 4 gig disk. So I figured well my 2nd 8 gig NEW Color Nook Tablet will be rooted since its just out of box and Iam doing all like I did when I had success on the first Nook. Now the unused 2nd Nook wont go to the brown box. Too strange. So I have 2 8 gig "NEW" color nook tablets that cant be rooted. To eBay they will go (at a great price by the way) if I cant figure this all out.
Thanks everybody for your help. I tried all the methods. As I mentioned in my post I had GREAT SUCCESS on my first try with the sd card I was using. Everything went crazy when I factory restored my nook and went back to trying to root it again. Using same disk same procedure as before. And now I have tried 3 other sd disks and of course win32diskimager. And as I mentioned I went to root my second new nook 8 gig tablet and now that does not work EVEN USING the same exact disk that I rooted my first tablet with. I KNOW THIS CRAZY but its like BARNES and NOBLE knows something after my first root and my account and somehow prevented me doing any more roots. Otherwise my second new 8 gig should of rooted with the same sd disk as I originally rooted my first. This is like the twilight zone. I really do have to sell these 2 new 8 gig nooks as they are worthless to me if I can reroot and root them.
The problem stems from not the disk you are using, but how it is getting burned. The disk must be formatted so that the first partition starts exactly on the 63rd sector of the disk or it will not boot. That sometimes is hard to achieve. Apparently it worked the first time you tried it. All I can suggest is to keep trying with different combinations of burning software, computers, and readers.
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