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I just installed a SSD kit I bought from iFixit (1TB Crucial SSD, IF174-031-3). I booted from an external drive and ran DiskUtility. Erased drive and formatted as APFS/GUID. Then installed macOS High Sierra. Install ran fine. Tried to reboot from SSD and all I get is the flashing question mark. iMac still boots fine from external drive. Any ideas here?
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You’ll need to go back and reformat the SSD this time GUID journaled file system (HFS+) as your systems firmware was not properly updated to support GUID - APFS
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I tried this and it still just boots up to the flashing question mark. Any other suggestions?
Restart your system and this time press the Option (⌥) key to get to the Startup Manager. Do you see your internal drive? Then use the arrow key to select it did it boot? If it did you'll need to go into the Startup Disk preferences to alter the setting.
If you don't see if or it is unable to boot then I'm suspecting the drive you installed is not the correct drive. This series needs a SATA II (3.0 Gb/s) drive, either a fixed speed SATA II or an auto sense drive which offers compatibility with SATA II systems. You may need to return the drive.
Reference: Mac startup key combinations
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