Good morning folks,

I can't wrap my head around this one.

I recently upgraded a failing 250 GB HDD to a 1 TB SSD and transitioned the data using a hard drive duplicator.

When starting from a cold start, the computer boots fine and works very well. However, when starting from a restart, the computer shows the prohibitory sign forcing me to turn off the computer. Since the subsequent start is a cold start, it then works fine again.

Does anyone have any insight as to why a system reboot would cause this behavior?

The OS is Sierra. SDD was checked and repaired using DiskWarrior. Apple Hardware Diagnostics reported "No trouble found"

It may help to note that the original HDD was throwing an I/O error in verbose mode and would not boot, but was able to be copied with a duplicator to the new SSD.

Thanks mate!

  • What kind of 'duplicator'? – Tetsujin Jul 20 at 15:06
  • Like this, but an older model: amazon.com/Aluratek-External-Portable-Duplicator-AHDDUB100/dp/… – Mark Jul 20 at 15:22
  • I have no clue how that would actually transfer the data. One of the QAs underneath says you need to use CCC or similar for Mac drives, which makes me think it's just a file copier which can't natively read HFS or APFS itself. It does make me suspect your SATA cable, rather than either of the drives themselves. – Tetsujin Jul 20 at 15:36
  • I've used it successfully before for other Macbook hard drive upgrades. I also started to suspect the SATA cable :-( – Mark Jul 20 at 15:46
  • If you've used it successfully on multiple occasions, then I'm down to 'SATA cable' too. If it aint the duper, it's something else. 2 drives, similar symptoms... the weak link is... – Tetsujin Jul 20 at 15:50

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