Chosen Solution
I purchased a used Late 2012 i7 with 16 GB of RAM & a 2.25 TB Fusion Drive that was running High Sierra, The computer seem to be working fine, until just before Christmas it booted once and I got the prohibited symbol. I had not yet moved things over to it so I did not loose much. I rebooted into recovery and reinstalled the OS. It worked fine for a few days then it happened again. I ran disk utility in recovery mode then disk first aide without much progress. I reinstalled the OS through Disk Utility and 6 hours later I was running again but hesitant to use this machine as a main hub for photos and my iTunes library now that I have had 2 crashes in a few days. I have searched the web with little to show for it. I ran Ertchecker and came up with the some results however my post has been deleted 3 times already and i think that is why. EtreCheck Report Is the drive failing or is there something else? RAM? The SATA Cable to the drive? I also saw on this: Upgrading from HDD to SDD, but get prohibitory symbol when booting up?. Is this possible? I thought It might be my 2TB mechanical drive was starting to fail but searches on the internet came up with nothing. I now see looking back through one of my RAM chips was not seated correctly or is starting to fail. I know when I got the computer when I ran system profile that the I had 16 GB of RAM. If one ram chip was not seated would it boot at all?
I’m suspecting your system is accessing the original owners iCloud account which is set to delete the drive. You’ll need to contact the original owner or get your money back from the seller.
