Hi all, I was facing the problem mentioned in this thread http://forums.macrumors.com/threads/help-please-apple-id-problem-on-macbook-pro-and-iphone.2017952/ and I have decided to wipe off my entire Macbook disk and do a Time Machine Restore. Now the thing I want to do is to use a brand new Apple ID for future use. I will not be using the old ID and I wanted to ask that if I do a complete Time Machine Restore after wiping the disk: 1. The laptop came originally with Mac OS X Yosemite. Will it now download Yosemite or Sierra? 2. Will it require my old Apple ID or will any Apple ID will work? I'm asking this as the old Mac OS Sierra purchase was made from my Old Apple ID. So how would the new Apple ID work under this scenario? 3. Will it, at any point, demand for the old Apple ID? I'm asking this as my old Apple ID has been locked out and I can't access it. Please help me by giving answers to these questions.