Clone hdd to ssd macbook pro 20124/16/2023 ![]() ![]() ![]() If you have the old hard drive you pulled out when you swapped the SSD in, you can attach that drive to the computer with a USB or FireWire adapter/case, boot from that, then format the SSD, download the OS installer and run it on the internal drive. The installer has a copy of Disk Utility, which you can use to format the internal SSD you can then run the installer and you'll get a plain-vanilla El Capitan system. If you have access to another working Mac, you can download an OS X 10.11.3/El Capitan installer from the App Store and then clone the installer to a thumb drive. In order to set up the new drive, you have to boot from something else to get access to the formatting tool (Disk Utility) and an OS installer. The flashing ? is the sign that the iMac can't find a bootable OS if you attach a bootable drive, the iMac will grab onto it and boot from that drive.
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