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"Still waiting for root device" after 10.10.3 update

Hi and thanks for any help you can offer,


My Mac has been working at 10.10.2 and previous versions with a Crucial CT480M500SSD1 SSD for seven+ months until I updated to 10.10.3 (which may be coincidental). Now, I cannot boot from the drive with the eventual message "Still waiting for root device".User uploaded file

User uploaded file


Things I've tried:

  1. Firstly the error I had was a grey screen with a mouse pointer I could move on it but nothing else would happen. Because I have a bluetooth keyboard I couldn't boot to safe mode or reset the PRAM directly, so I took out the SSD drive and booted to the time machine partition. From there I used e.g. nvram boot-args="-x -v" to boot to safe mode, which worked and I rebooted immediately, subsequent boots would not work at all, even to safe mode.
  2. Still without a USB keyboard I used the Time Machine partition (pulled the SSD out to boot to it) to reset PRAM (via boot-args), NVRAM, didn't work.
  3. I brought a USB keyboard home and used it to boot to TM and restore a 10.10.2 version of the SSD from before the update. Same problem. I have even restored versions from December with the same result, as above.
  4. I have a previous SSD laying around with Mavericks on it, it boots fine.
  5. I have run bless --folder /Volumes/Beep\ Beep/System/Library/CoreServices --bootefi


Any other ideas or can anyone give an explanation of how the root device is determined and found? I've read some things about needing to have kexts that read from the drive, but it doesn't seem like

Thanks, Dan.

OS X Yosemite (10.10.2)

Posted on May 3, 2015 2:28 AM

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Posted on May 3, 2015 2:49 AM

Did you have TRIM for the SSD enabled?

https://www.cindori.org/trim-enabler-and-yosemite/

6 replies

"Still waiting for root device" after 10.10.3 update

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