A friend of mine who is a Pc repair guy with not much Mac experience replaced my dead HD in an early 08 iMac with a Samsung Evo 860 SSD. We did not format the disc. When I try to boot from old install discs I just get the folder with ? mark. I tried to boot from a bootable drive I made by partitioning out part of an external HD but all when I turn on and hit command R with the bootable drive, I get the apple logo for about 10 minutes and then it restarts itself. Am I doomed since we didn't format the drive or is there a way to do it after it's been installed. I have zero skill when it comes to this stuff and am hoping not to have to ask my friend to take it all apart again. Thanks, everybody.