Question by Aderhold: Nook Color Flashed With Honeycomb Can’t Download Apps In Market Due to Talk Authentication Failures?
For starters, let’s talk build.

It WAS a stock NookCOLOR Ver. 1.1.0
Then it was rooted using TheUnlockr.com’s method, located here: http://theunlockr.com/2011/02/05/how-to-root-the-nook-color-autonooter-method/
After rooting the NookCOLOR it was flashed with Android’s Honeycomb OS v4. using, again, TheUnlockr.com method located here: http://theunlockr.com/2011/02/10/how-to-flash-honeycomb-w-the-android-market-onto-the-internal-memory-of-the-nook-color/

Everything was working just fine, I was logged into Talk, GMail, and the Market. I downloaded Angry Birds successfully. I went to download the Kindle app, Nook app, and I paid for Manga Watcher. These did not download.

After downloading Angry Birds I believe I played it, shut the NookCOLOR off and turned it back on before proceeding to download the other apps. (This may be a cause.)

Now Talk will not sign in, thus Market will not download my approved or purchased apps.

I’ve tried many of the solutions on the Android forums and Google forums. I’ve tried the hard reboot, the change from @gmail.com -> @googlemail.com, the removal of gmail account and re-input (wouldn’t let me delete gmail account, said apps needed it to run. So still an option if able to achieve suitable outcome.)

I don’t wanna re-flash the “Tablet”, but will only as a last resort. That is if all else fails…

Thank you for all your help,

-
Aderhold

Best answer:

Answer by Lena V
Restore it to factory settings and then go buy a Micro SD card from this site, www.Nook2Android.com.

The SD cards root your Nook legally and do not void the warranty.

They also have the marketplace and several other apps already installed, such as Angry Birds, Words with Friends, Pandora, Netflix, Facebook, etc.

Add your own answer in the comments!