(from amazon, try this)Hi guys - I really need som help here (please) !!
Just installed a fresh new Sintech Adapter and WD SN750 1TB SSD bought from Amazon in my iMac 27” Late 2015 (running Catalina 10.15.4, SilentKnight reports EFI firmware 176.0.0.0.0 is up to date) both parts should be compatible following various articles that i found.
But my Mac can't find the disk in Disk Utility (with expanded the view) ,-(((
I boot into recovery mode from a USB-boot (also Catalina 10.15.4) and have also tried via a USB-Ubuntu with the disk utility with no luck .....
Additional steps:
4a) for me the Disk Utility would not show the Drive, so what I had to do was shut down the MacBook.
4b) When the device has fully shut down press the Power button again, when you press the power button hold down the following Keys: 'Command/cmd' and 'Option (sometimes this is shared with the alt key as it is with mine)' and 'P' and 'R'
4c) Hold the 4 keys, you will here the MacBook chime, keep it held until it Chimes again and then release
4d) After then wait for the MacBook to boot up into the Recovery Partition and look in Disk Utility, you should see the drive in Disk Utility now. The laptop will reboot a few times before booting into the Recovery environment