Yosemite Clean Install Problems
Hi,
I have recently tried to do a clean install of the Yosemite OS but the install was unsuccessful and I have had nothing but trouble since. If you have any ideas on how to fix my problem, I'd be very grateful. Perhaps you have or have had the same problem and have some other ideas on how to fix it.
(Note: Recently I have not used TimeMachine as it kept on corrupting my external HD, so I have backed my files up manually on another volume but no previous OS backup to revert to)
This is what I've done:
Attempt 1: Bootable USB
I created a bootable USB of Yosemite (via Terminal etc.). I was able to install Yosemite and it restarted. On restart, it continued to install the other system files, but suddenly stopped as it "could not extract files from BaseSystemBinaries.pkg". I restarted the Mac and it continued to install the other system files, but after a while it came up with a message saying "couldn't attach disk image". Then I tried once again and it came up with some other error message. I went into Disk Utility, erased the disk and the Macintosh HD partition and attempted to re-install Yosemite from the USB after another restart. Despite having erased the disk, the installation went straight back to installing the excess files (I guess once you get to that point, it remembers and you can't get out of it until the process completes). Unfortunately, once again, error messages came up. (Note: USB was formatted for Mac Os X Journalled thingo)
Attempt 2: Internet
I removed the USB and it said I could install the extra files from the net. I entered my WIFI code, AppleID password etc and the download started. Unfortunately I do not have 293 hours to wait until the download completes, and after waiting two hours and noticing the download had another 394 hours to go, I decided this was not going to work.
Attempt 3: Downgrade
I hunted around in my old CDs and DVDs and found a bootable DVD of Mac OS Lion. It installed completely and I was so over the moon! I Then thought - ah, perhaps I can upgrade from Mac OS Lion to Yosemite. I copied the Yosemite Installer from the USB on to my Mac and started the install. All went well until the computer restarted and proceeded to install the excess files - once again, I had problems as the "BaseSystemBinaries.pkg" couldn't be opened.
Attempt 4: Confused
I figured that I would easily be able to downgrade again considering it worked last time. I did exactly the same things - erased the disk in Disk Utility etc, but for some reason, the install failed and each time I tried to restart, the Mac returned to the same place (a bar "installing Mac OS Lion) and failed shortly after.
Thoughts
1) How do I get the Mac to forget or erase the previous install attempt so I can attempt another fresh install. It remembers which stage of install the installer is at be it for Yosemite or Lion. It keeps returning to the same stage and fails. Even after erasing the disk and partition, and resetting the PRAM.
2) Could my Yosemite Installer be corrupt? How on earth could it become corrupt after installing from the internet? What if I had not attempted a clean install, upgraded. I'd be in the same position and if I hadn't backed up, lost absolutely everything...
iMac