These are related but not identical issues. Question (?) Mark, Blinking Folder, or Gray Screen at Startup Mac OS X- Gray screen or prohibitory sign appears during startup I can drag all my files over though and reload the applications and all that nonsense but I prefer to just have the 1 TB drive be the start up disk and go from there. Of course I cannot restore the data from Time Machine because it doesn't let you. Any advice would be appreciated.īTW- I did take a 3 TB drive and loaded 10.9.5 on it and it boots fine. I booted the computer and tried to restore from Time Machine again. I took the drive out and placed a new WD 1 TB drive that had been formatted for a Mac into the slot. It was a Seagate and I hate Seagate but I digress. I thought perhaps that the Hard Drive may be bad. I then used another Time Machine backup from a week before. I used the last backup yet this failed upon bootup and gave the same prohibitory sign. Thus, I tried to restore using Tme Machine. Either settings between the software and computer hardware are not in agreement, or there is a missing critical component to the OS X installation. From what I can understand, this symbol at boot means the system has found a bootable installation of Mac OS X on the system, but there is something wrong with it. Suddenly the computer on start up gave me the prohibitory sign. Mac Pro Tower with 3 hard drives (1 TB -start up 2 TB - data 3 TB -time machine backups)ġ0.9.5 backed up weekly to internal 3 TB drive
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