Every potential issue may involve several factors not.
Macbook no entry sign.
This means one of two things.
Macbook no entry sign at startup grey screen more less.
Managing a prohibitory sign at os x bootup.
Either the system on the hard drive has been corrupted and it can t boot from it or the hard drive itself is damaged.
I was happily browsing the web when the macbook decides to freeze and reboot to the no entry sign.
You don t say how old your macbook pro is so that could also be a factor.
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Thanks for the a2a.
Model a1502 2 4 2 6 or 2 8 ghz dual core intel processor released october 2013.
Mac os x has several bootup symbols including a universal prohibitory sign that indicates critical files are missing from the boot volume.
Checked the connection to the ssd and it s absolutely fine.
Seeing a no entry sign after a new crucial m500 installation i just installed a new crucial m500 drive into my 2009 2 0 ghz mac mini.
When starting your mac if you run into a prohibitory sign and the system will not boot there are a couple of things you can try to address the problem.
Macbook pro 13 retina display late 2013.
I then tried booting to the recovery drive and got nothing.
Resolve boot issues showing prohibitory sign.
If your mac is using a firmware password the lock icon appears when you try to start up from another disk or volume such as an external drive or macos recovery enter the firmware password to continue.