Reading through the old thread, I read that someone suggested doing the OS install with the SSD installed internally versus via USB as I had done.I switched everything back to the original configuration and it worked fine, meaning that I could boot from the old HD installed internally and I could boot from the SSD attached via USB. When I attempted to boot up the laptop, I got the "Stop Sign" and the laptop would not boot. I opened up the laptop and swapped out the old HD with the SSD. The laptop booted up and everything looked great. Once the process finished, I restarted the laptop while pressing down the Option key and chose the SSD as the start-up disk. After the OS installed, I used the Migration Assistant to migrate applications and data from the old HD to the SSD. In Recovery, I used Disk Utility to erase the SSD (still attached via USB) and then installed Sierra from the Internet.
I started up the laptop while pressing down the Option key to get to the Recovery disk. I decided to do a clean-install of the OS.I figured that this might be because the old HD had some errors. CCC said that the clone would not be a bootable disk because a file was missing on the old HD. I attached the SSD to the laptop using a SATA-to-USB adapter, erased it using Disk Utility and started to clone the old drive using Carbon Copy Cloner.Here is a summary of what has happened to date: The 16GB RAM installed without any problems but the SSD installation is not working at all. I purchased 16GB RAM and a HP S700 2.5" 500GB SATA III 3D NAND SSD and attempted my installation. My old HD was having issues so it seemed like the right time to make the change. I have a 13" MacBook Pro Early 2011 (2.7 GHz Intel i7) running Sierra OS and I wanted to install more RAM and an SSD to speed it up. I have seen an old thread on this issue, but because it is old I thought I would start a new one.
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