OSX Yosemite update 10.10.4 no entry sign on boot

OSX Yosemite update 10.10.4 no entry sign on boot

I am using a Macbook Pro from 2010 with an after market SSD. Everything worked great until I updated to OSX Yosemite 10.10.4. After a reboot my Macbook Pro only showed this sign:


After some digging it turned out Apple implemented TRIM support for after market SSD’s. I have always used Trim Enabler which worked great. Now with the 10.10.4 upgrade something made my Macbook not booting anymore.

I tried a few things to solve this issue:

  1. Reset PRAM (alt + cmd + P + R)
  2. Boot into restore (cmd + R) and checked disk for errors (none found)
  3. Restored my latest 10.10.3 backup (no luck)
  4. Reinstalled OSX (did not erase my files or applications)

The latest option took almost two hours, but after this I was able to use my Macbook again with 10.10.4


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