Yosemite installation won't recognise Apple ID and password

I am trying to install Yosemite on my iMac which appears to have been successful until my AQpple ID and password was required. The system is locked up after sending an email with my sign-in information to reset my password. I have had to go onto my MacBook Pro running Maverick to sign into Apple Support Communities with the same Apple ID and password used on the iMac. I also checked the accuracy of my Apple ID and password by successfully logging into my iTunes account. My MacBook Pro also completely locked up when trying to install Yosemite and after two Genius Bar appointments failed to overcome the problem. Although the hard-drive checked out on test, both technicians suggested replacing the hard drive as a solution. After much fiddling, I managed to get back to Maverick operating system, which is still operating faultlessly and the computer used to access this forum. The email that was supposedly sent to me has not been received at my Mail account, even though my aApple ID is my registered email address with Apple. Any thoughts on how to overcome this situation.

Thanks Eric for your reply. Unfortunately, screen was locked on "email sent to reset password", so in total frustration, turned iMac off and restarted to find Yosemite installed and ready to go without Apple ID or password required. I did not notice a skip option but it is now obvious that an Apple ID and password was not required to install. I am still mystified as to why, even when the correct password and Apple ID was entered, it was rejected. Most annoying having to reset password when not necessary. But everything from Maverick seems to be working OK.
I'm yet to retry installing Yosemite on my MacBook Pro, fearing the disasters and frustration at two Apple Genius(?????) Bars last month. But I will take your advice and do two back-ups (I only did one with the iMac and that was to Time Machine) before trying again. What is your reason for the second back-up and are you suggesting a different external drive to that used for Time Machine? Just as a precaution? Thanks again for your help.

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