Chosen Solution
Greetings. My MacBook Pro does not recognize the internal SSD when I try to install macOS on it from a USB thumb drive. However, If I start up from a external Mac OS X 10.7 disk from another computer, It shows on the desktop. If I try to run Internet Diagnostics I get the error code -6002D. Any help would be great. Thanks :)
Have you ever formatted it for High Sierra or Mojave? It may be formatted APSF instead of GUID.
Take a look at this post Prohibitory sign after SSD Upgrade Have you tried exchanging the internal SATA cable on your laptop? Have you purchased the iFixit cable? I recently upgraded a MacBook Pro 13” Mid 2012 with an SSD, it worked perfectly for about 4 days and then I got the Prohibitory sign. I’m trying to find a fix for it. Some posts refer to the internal SATA cable that might not be suited for the fast SSD speeds but the replacement cable that iFixit sells doesn’t say anything about compatibility with SSDs so I’m hesitant to buy it.
