Try the following:
1) Restart your Nook Color.
Press and hold the power button for 20 seconds. That will turn it off.
Press and hold the power button for 4 seconds. That will turn it on.
2) Now go to Settings (not to Quick Settings). In settings go in and turn on WiFi.
I'm having the same problem it keeps saying error when ever I turn on wifi. I've tried resetting it and it won't work! What should I do?
again, you don't understand...wifi was working great, never a problem....all of a sudden the wifi will NOT turn on. I keep getting an error code. Barnes and Noble associates do not seem to know what they are doing. Turning it off an on will not help. The thing was expensive and i just want someone who has a clue to fix the darn thing!!