オリジナル投稿者： Dan ,
The SSD is compatible as it auto senses the systems SATA port which is SATA II (3.0 Gb/s). So thats not an issue here. I'm suspecting the drive cable might have gotten damaged. Do you have access to a second Mac system which you can connect to this one and then put the system into target mode? If you can try running Disk Utilities First Aid to see if the drive is OK (it makes no difference which drive you have installed here). If the drive comes back with errors then I would replace the cable. Here's the IFIXIT guide: [guide|1685|MacBook Unibody Model A1342 Hard Drive Cable Replacement]. If you can't get the system into Target Mode, you have bigger problems.