Q Folder at boot

2012 A1278 13" MBP - We get a Q mark folder when we boot up.

The SSD is new & has a fresh Catalina installation which we performed on another unit of the same year so that is confirmed to be working.

I have tried 3 or 4 different connection cables so I doubt that will be the issue.

The 'latch' is secure (4 minute mark on this video)

Are there any specific data lines or components we should check on the board and if so which ones? @oldturkey03

Answer this question I have this problem too

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