Chosen Solution
I installed the SSD following the instructions on this site. I booted the first time in Internet Recovery Mode and let it do its thing. When it brings me to the next set of menus with the Disk Utility the SSD doesn’t show up? All cables are connected and none are damaged. I put the old HDD in again and it works just fine. Is there something I’m missing with the SSD that I need to do? I’ve tried plugging the HDD in with USB and booting from it which works, but the SSD still isn’t recognized in the Disk Utility. I’ve tried putting the SSD in the USB enclosure and it is recognized. So i reformatted and ran First Aid but still it doesn’t boot correctly. I’ve tried carbon copy cloner of my HDD to SSD and then booting the SSD gives me the greyish screen with a circle with a line through it.
I’m thinking the drive cable has degraded so the faster data flows with the SSD is having problems. I’ve had a few that needed replacing. Hard Drive Flex Cable, Lower Bay - Apple P/N 076-1390Hard Drive Flex Cable, Upper Bay - Apple P/N 076-1391
Format it first…to allow mac to recognized it…use disk utility….
