Mac instantly freezes upon log in
Hello,
I have a late 2013 MacBook Pro with 4GB of RAM and 500GB hard drive, running the latest version of Yosemite.
My problem started about 2 weeks ago when I switched on my MacBook and whilst trying to log in, it wouldn't accept my password. I entered in correctly (I'm 99.9% sure) several times until it told me I would have to do a password reset. I did, and it was ok. Worried about the message, I downloaded an antivirus (BitDefender I think?) from the Mac App Store and run a full scan, which completed and said my Mac was clean. I then did the software update which included Photos, removing iPhoto and my librabry started to upload to iCloud fine. I switched it off a few hours after when I went to bed (it hadn't finished uploading photos at that point).
A couple of days later, I booted my Mac up, it started fine, requested password and that was fine. Once the desktop loaded and I clicked an application to open it, the spinning wheel spun endlessly until the screensaver attempted to come on, but the screen just went black. I clicked to wake it, several minutes later the login screen appeared, I typed my password in and about 3/4 minutes after that, it acknowged that I'd entered my password and proceeded to a black screen with a spinning wheel. Several minutes later it returned to the desktop with the wheel still spinning endlessly. I tried cmd + q and fore qutting to no avail so did a manual restart by holding the power button and restarting.
It now just does the same every time! But it's also started popping up with messages requesting a certain app is asking for my iCloud keychain password. "cloudd wants to use the login keychain" mailsync, messages, callassist and others to name a few.. If I do enter the iCloud keychain password it instantly freezes, otherwise I click cancel and it will be ok, but then something else asks for iCloud keychain password. If I just ignore the messages I can't open any apps without them crashing almost instantly and the whole computer becoming unresponsive.
I've tried booting into disk mode, have verified the disk, which said it was ok, attempted to repair the disk, but it tells me no problems were found. I've done Cntrl + S at restart and run fsck -fy which ran, told me my disk had been modified, ran it again, said everything was ok. I optomistically booted up but the same problem occoured.
I have a feeling it's an issue with my iCloud keychain password and my Apple ID becuase of the message that keeps popping up. I've tried opening iCloud settings in settings, but that crashes the computer. So I can't reset my keychain. I spent an entire day waiting for it to respond to 'verify' and 'repair' my keychain, but it said everything was ok.
I'm at my wits end now 😟 I would happily wipe the drive and start again, loosing all of my software and other files, but the only thing holding me back is the 8,000 photo's/video's that didn't upload to the cloud, which will mean I will have lost them forever as I no longer have them on any other medium 😟
Please help me !
Thanks,
Henry
MacBook Pro, OS X Yosemite (10.10.3)