Hello — hope to get some advice. I have a mid-2011 21.5 inch iMac running on High Sierra and I attempted to replace the HDD with a new 2TB Crucial SSD (CT2000MX500SSD1) but am experiencing a non-detection error — an alternating question mark folder icon with the Apple logo and a cross icon.
These are my steps:
1. I removed the original 500GB Seagate HDD from my iMac and attempted to fit the SSD directly into the space (straight from the packaging without doing any preparative work) utilising a new thermal SATA cable and 2.5" to 3.5" mounting kit
2. I then rebooted and hoped to see the new SSD to perform a restore (tried holding down the Option key (for the startup manager) and again with Command+R (for recovery)) but couldn't see it
3. I opened the iMac again and double-checked the internal connections to the SSD with the SATA thermal sensor, data and power cables but they were nicely connected and I rebooted but still got the same issue
4. I took the SSD out of the iMac and used my 2018 MacBook Pro to erase and format it with the Mac OS Extended (Journaled) option
5. I then tried refitting it again in the iMac and rebooting. Still no joy
6. I tried again without going via the thermal sensor SATA cable but instead going directly with the iMac SATA cables — still no use.
7. I then decided to use an external caddy for the SSD to connect to the iMac via USB where I could successfully initiate an internet recovery to install MacOS and then do a TimeMachine restore
8. Whilst it was connected externally via the caddy it booted up okay and I could use the iMac as normal — but obviously I want to install it internally
9. I then opened up the iMac again and tried to install the SSD, rebooted and it failed again
10. I then put the original 500GB HDD back in to check I hadn’t accidentally damaged the cables / sockets but it booted up fine. I then swapped it back with the new SSD but again got the non-detection issue
Not sure where to go next — so would welcome any suggestions.
On a side note, I'm not sure if this is related, but might be worth mentioning. When I tried to boot up externally with the original HDD using the caddy, the iMac wouldn’t detect it, but it did detect the old HDD internally — and as mentioned, the caddy works fine booting up the iMac with the SSD.
Thanks in advance for any assistance.
These are my steps:
1. I removed the original 500GB Seagate HDD from my iMac and attempted to fit the SSD directly into the space (straight from the packaging without doing any preparative work) utilising a new thermal SATA cable and 2.5" to 3.5" mounting kit
2. I then rebooted and hoped to see the new SSD to perform a restore (tried holding down the Option key (for the startup manager) and again with Command+R (for recovery)) but couldn't see it
3. I opened the iMac again and double-checked the internal connections to the SSD with the SATA thermal sensor, data and power cables but they were nicely connected and I rebooted but still got the same issue
4. I took the SSD out of the iMac and used my 2018 MacBook Pro to erase and format it with the Mac OS Extended (Journaled) option
5. I then tried refitting it again in the iMac and rebooting. Still no joy
6. I tried again without going via the thermal sensor SATA cable but instead going directly with the iMac SATA cables — still no use.
7. I then decided to use an external caddy for the SSD to connect to the iMac via USB where I could successfully initiate an internet recovery to install MacOS and then do a TimeMachine restore
8. Whilst it was connected externally via the caddy it booted up okay and I could use the iMac as normal — but obviously I want to install it internally
9. I then opened up the iMac again and tried to install the SSD, rebooted and it failed again
10. I then put the original 500GB HDD back in to check I hadn’t accidentally damaged the cables / sockets but it booted up fine. I then swapped it back with the new SSD but again got the non-detection issue
Not sure where to go next — so would welcome any suggestions.
On a side note, I'm not sure if this is related, but might be worth mentioning. When I tried to boot up externally with the original HDD using the caddy, the iMac wouldn’t detect it, but it did detect the old HDD internally — and as mentioned, the caddy works fine booting up the iMac with the SSD.
Thanks in advance for any assistance.