Unable to boot from Sys HD, Recovery HD, or USB, get white screen
Mac Mini A1347, 1TB SSD installed with 16GB memory. Was working fine for months, installed latest Sierra 10.12.2 update and white screen after restart! Tried PRAM/NVRAM and SMC resets. Get white screen after Apple logo appears and progress gets 1/2 way. Any suggestions?
I had disconnected all peripherals and performed SMC reset, still would not boot up. Started up in Single user mode and ran fsck (file system check) with no errors. Created Sierra OSx installed USB stick. Started up in Disk Manager mode and selected USB, Sys HD, Recover 10.12.2 and all resulted in same outcome, white screen after Apple logo and progress bar 1/ 2 way completed.
Removed 2 memory sticks and re-installed top stick in lower bank. Boots up to Apple logo and progress bar 1/2 way but now shuts down!
Started up holding down Ctrl - D (windows keyboard) to run Apple Hardware Test. Ran 2 passes, no problems found.
Started up in Safe Mode. In terminal prompt typed in fsck (file system check). Received the following;
- Checking catalog file
- Invalid node structure (4,3305)
- The volume System HD could not be verified properly
First, get the name of the partition of the failing volume. You can get it most easily by finding your disk in Disk Utility, selecting your partition (not the drive) and type cmd-i. Look for "Disk Identifier" right at the top.
Then, open up Terminal, and type this:
sudo /sbin/fsck_hfs -yprd /dev/disk5s2
substituting your disk identifier for the one already here. Keep the "/dev/" part. Enter your password, and wait. It may take a while. I have had this fail several times before finally working so its important to keep trying. It's faster than a reformat!!!
If the afflicted disk is your startup disk, you will need to do this in single user mode: restart the computer, hold down Command S, and wait for the terminal window to appear.
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