Yes, with a bad optical drive. You've tried two different discs, so that implies it's not likely the discs. You've tried two different "hard" drives, so it's not likely the drive. Supposedly, one of your sticks of RAM failed memtest, so you do have a bad stick of RAM. What's next is the optical drive. You said earlier something about a disc image, so if you do have a good disc image, you can image that to the back 8GB of one of your drives, then boot from that and run the installer. You'll have bypassed a possible bad optical drive.