I have a installed the free upgrade to yosemite but cannot get my computer to open.  Just get a grey screen, not a sign in screen.  How do I get it to start up?

I installed Yosemite on my Mac and after over 2 hours, the computer went to reboot.  A grey screen appeared and that was all that happened.  I couldn't move the cursor to close out.  I could not force quit.  I had to turn off the computer with the button.  Upon turning the computer on again, the apple icon showed up with a progress bar under it.  The progress bar proceeded to move until about 1/3 of the way across and then a lank grey screen appeared again  The arrow cursor appears, but no screen sign in or anything else will appear.  Again, to turn the computer off, I have to hit the button on the back of the computer and then I return to the loop again  Help!

Do you have your Mac backed up?
If not, you should use Time Machine to back up your Mac to an external hard drive just "in case".
But if all you did was change your existing ID, then deleting the Calendar infomation from the Mac when you sign out should not be an issue. Since it is the same Apple ID, it is the same iCloud account (just with a different name), so your Contacts, Calendars, etc. are stored in iCloud. When you sign back in, you will have the option to sync Contacts, Calendars, Notes, etc. with iCloud - it should already be checked. Just sign back in, and your iCloud info will re-download to your Mac.
I just tried this, and all of my stuff showed up when I signed back in. Notes took a couple of seconds to load once I opened them, but they are all there.
Note: If you are signing on with a brand new Apple ID, then nothing will be downloaded because it will be an entirely different iCloud account. But if it is the same Apple/iCloud/iTunes ID with just a new email, then it will all be restored.
Cheers,
GB

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