While I do recommend enabling TRIM services for any 3rd party SSD. Your issues don't involve its setting.
Go into System Prefs and look at what Startup Disk reports as the startup drive. Select your SSD and reboot did that fix it? That should fix the prohibitory symbol problem, as the systems setting was lost.
What is your OS version? Depending on what you have or are planing on upgrading to the most current will dictate which method will be needed to enable TRIM.
=== Update (02/24/2016) ===
The issue you are now facing here is two fold:
-
* The SATA speed the the drive and what the system was designed to support
-
* The SATA cable often needs to be upgraded
+
* The SATA speed of the drive and what the system was designed to support
+
* The SATA cable often needs to be upgraded or is damaged
So, the first thing here is to make sure the systems firmware is up to date. From an external bootable drive follow this Apple T/N: [https://support.apple.com/en-us/HT201518|About EFI and SMC firmware updates for Intel-based Mac computers]. Make sure you are at the level listed or newer. Don't try doing this from your internal SSD drive! You could corrupt it.
The next thing here is the original Apple HD was likely a SATA II (3.0 Gb/s) drive. Now you are attempting to put in a fixed SATA (6.0 Gb/s) drive. Sadly, you can't do this until you upgrade the SATA drive cable as the older cable can't support the higher data rate. Make sure you install the correct rev cable. Here is the needed part: [product|IF163-041]. And here is the IFIXIT guide you'll need to follow to put it in: [guide|10379|MacBook Pro 13" Unibody Mid 2012 Hard Drive Cable Replacement].
While I do recommend enabling TRIM services for any 3rd party SSD. Your issues don't involve its setting.
Go into System Prefs and look at what Startup Disk reports as the startup drive. Select your SSD and reboot did that fix it? That should fix the prohibitory symbol problem, as the systems setting was lost.
-
What is your OS version? Depending on what you have or are planing on upgrading to the most current will dictate which method will be needed to enable TRIM.
+
What is your OS version? Depending on what you have or are planing on upgrading to the most current will dictate which method will be needed to enable TRIM.
=== Update (02/24/2016) ===
-
The issue you are now facing here is two fold:
+
The issue you are now facing here is two fold:
+
* The SATA speed the the drive and what the system was designed to support
* The SATA cable often needs to be upgraded
So, the first thing here is to make sure the systems firmware is up to date. From an external bootable drive follow this Apple T/N: [https://support.apple.com/en-us/HT201518|About EFI and SMC firmware updates for Intel-based Mac computers]. Make sure you are at the level listed or newer. Don't try doing this from your internal SSD drive! You could corrupt it.
-
The next thing here is the original Apple HD was likely a SATA II (3.0 Gb/s) drive. Now you are attempting to put in a fixed SATA (6.0 Gb/s) drive. Sadly, you can't do this until you upgrade the SATA drive cable as the older cable can't support the night data rate. Make sure you install the correct rev. Here is the needed part: [https://www.ifixit.com/MacBook-Parts/MacBook-Pro-13-Inch-Unibody-Mid-2012-Hard-Drive-Cable/IF163-041-1 - Apple P/N 923-0104]. And here is the IFIXIT guide you'll need to follow to put it in: [https://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Unibody+Mid+2012+Hard+Drive+Cable+Replacement/10379|MacBook Pro 13" Unibody Mid 2012 Hard Drive Cable Replacement].
+
The next thing here is the original Apple HD was likely a SATA II (3.0 Gb/s) drive. Now you are attempting to put in a fixed SATA (6.0 Gb/s) drive. Sadly, you can't do this until you upgrade the SATA drive cable as the older cable can't support the higher data rate. Make sure you install the correct rev cable. Here is the needed part: [product|IF163-041]. And here is the IFIXIT guide you'll need to follow to put it in: [guide|10379|MacBook Pro 13" Unibody Mid 2012 Hard Drive Cable Replacement].
While I do recommend enabling TRIM services for any 3rd party SSD. Your issues don't involve its setting.
Go into System Prefs and look at what Startup Disk reports as the startup drive. Select your SSD and reboot did that fix it? That should fix the prohibitory symbol problem, as the systems setting was lost.
-
What is your OS version? Depending on what you have or are planing on upgrading to the most current will dictate which method will be needed to enable TRIM.
+
What is your OS version? Depending on what you have or are planing on upgrading to the most current will dictate which method will be needed to enable TRIM.
+
+
=== Update (02/24/2016) ===
+
+
The issue you are now facing here is two fold:
+
* The SATA speed the the drive and what the system was designed to support
+
* The SATA cable often needs to be upgraded
+
+
So, the first thing here is to make sure the systems firmware is up to date. From an external bootable drive follow this Apple T/N: [https://support.apple.com/en-us/HT201518|About EFI and SMC firmware updates for Intel-based Mac computers]. Make sure you are at the level listed or newer. Don't try doing this from your internal SSD drive! You could corrupt it.
+
+
The next thing here is the original Apple HD was likely a SATA II (3.0 Gb/s) drive. Now you are attempting to put in a fixed SATA (6.0 Gb/s) drive. Sadly, you can't do this until you upgrade the SATA drive cable as the older cable can't support the night data rate. Make sure you install the correct rev. Here is the needed part: [https://www.ifixit.com/MacBook-Parts/MacBook-Pro-13-Inch-Unibody-Mid-2012-Hard-Drive-Cable/IF163-041-1 - Apple P/N 923-0104]. And here is the IFIXIT guide you'll need to follow to put it in: [https://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Unibody+Mid+2012+Hard+Drive+Cable+Replacement/10379|MacBook Pro 13" Unibody Mid 2012 Hard Drive Cable Replacement].
While I do recommend enabling TRIM services for any 3rd party SSD. Your issues don't involve its setting.
Go into System Prefs and look at what Startup Disk reports as the startup drive. Select your SSD and reboot did that fix it? That should fix the prohibitory symbol problem, as the systems setting was lost.
-
What is your OS version? Depending on what you have or are planing on upgrading to the most current.
+
What is your OS version? Depending on what you have or are planing on upgrading to the most current will dictate which method will be needed to enable TRIM.
While I do recommend enabling TRIM services for any 3rd party SSD. Your issues don't involve its setting.
Go into System Prefs and look at what Startup Disk reports as the startup drive. Select your SSD and reboot did that fix it? That should fix the prohibitory symbol problem, as the systems setting was lost.
What is your OS version? Depending on what you have or are planing on upgrading to the most current.