Jason269- If Diponio55's problem is anything like mine none of those articles/solutions/suggestions you and others have linked to will work; I've been trying them for days and nothing works. As said, I posted about this in my own thread and several others and nothing anyone has suggested has helped. I know my Apple ID and password are correct, they work everywhere else. I am seriously disappointed by Apple's lack of any response other than having Apple Support folks tell 100's/1000's of people (if not more) they have to restore to factory settings, setting up your device as new, activate iMessage and FaceTime and then restoring from backup which, from what I've read in these forums has not worked for all.
When is Apple going to acknowledge this bug/problem and fix it??