Won’t boot from new SSD
I have a 24” 2009 iMac that I’m trying to replace the original HDD with a Western Digital Blue 250GB SSD.
With the SSD in an external case the iMac sees it just fine and I was able to install OS 10.11 on it and even boot from it that way.
When I install it in the iMac it won’t boot from it at all. I just get a white screen with no flashing question mark??
Is this a good question?