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. Did you replace the existing hard drive cable with a shiny new cable?ġ) and 2) If you've installed a brand new, unformatted drive without attaching a drive with a bootable operating system, then the computer has no drive to boot from at all.Do you have some bootable drive (either the internal optical drive or an external) with an appropriate OSX installer ready?.Did you format the SSD as an HFS+ drive with GUID partition table before you installed it?.This should be pretty straightforward, but a couple of questions first:
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