Prohibitory Icon (Forbidden symbol) on MacBook Pro 13 early 2011 after installing new SDD Drive
I changed for the second times the ssd drive in this MacBook Pro early 2011, the previous one with macOS 12 Sierra stopped working with sudden blocks and it disappeared randomly from the desktop. I prepared an other SSD connected externally (as I did several times in the past) with a MacBook Air installing macOS High Sierra and transferring all the data. Mac OS High Sierra is the last operating system that MBPRO Early 2011 supports. It works fine externally in both computer, the Air and the MacBook Pro early 2011 but when I mount inside the MBPRO and boot the system it appears the forbidden symbol. I have resetted everything but still forbidden symbol appears. Dismounted and connected externally it boots fine again...
So I tried installing an other bootable SSD drive that I use to test old Mac machine with macOS 10.11 : It boots fine. I put the SSD with High Sierra inside the mbpro again and appears forbidden symbol. Any idea? I tried also changing the disk data cable inside the MBPRO but the same. Booting from external this disk works fine, inside not.
UPDATE : In the last days I bought an other SSD by Crucial and an other data cable to remove any doubt that these elements, even if new, could be defective, I made all the work again from the beginning but don't change anything : when I start up the Mac it appears the forbidden sign
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