prohibitive gray screen, but the start of the option works

I have a strange here.

Early 2011 MBP - OSX 10.10.5.

Everything was fine with the computer, and then all of a sudden the small wheel of death... computer slows down to a stop and then screen black.

At startup - gray screen, blinking prohibitory sign several times and then begins to my second hard drive installed (I replaced the optical drive with a 2nd hard drive just in case something like that happens... more... that uses optical discs still!).

I checked the "Startup disk" options in the preferences, then re-selected my SSD as my default player.

Restart in safe mode... works as expected on the SSD.  Check disk utility, verify and repair permissions, checked the disk and, say, "could not mount the drive" (perhaps something to do with safe mode?).

Restart again normally - prohibitive flashes and then after a few seconds, it starts as normal.  I checked the disk utility again, checked and repaired permissions, disk verified and no problem with the disk on THE.

Stop and try again... lightning prohibitive and then after a few seconds, it starts as normal.  I have reset the SMC and the NVRAM.

Not sure why I get this prohibitive symbol!

I have restart holding 'option', all disks appear (SSD, HDD, recovery), so I click on SSD and it opens fine.

Tips for how to start normally (without the prohibitive sign)?

Thank you

N

A few ideas.

Start - prohibitory signs when OS X starts

Tags: Mac OS & System Software

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