So, I ordered a new SSD drive and a mounting kit. I took the SSD drive and cloned the complete OS onto it and used a USB dock to test. I was able to successfully boot to the SSD drive. I followed these directions and installed the drive. Everything went smoothly until I tried to boot. I get a blinking question mark. The computer does not recognize the drive inside it.
I know the drive works.
Is there a chance that the SATA cables are bad?