OK. I just installed a new SSD hard drive into my imac24 (2008ish) and tried to restore and got stuck with the flashing ? folder. I was running Sierra on my old hard drive, and I guess my imac is too old to do a internet restore. I panicked and remembered that I had an old 10.5 leopard DVD, so I used that and formatted the new hard drive. Then I tried to restore from a time machine back up. No go because I am running an old OSX. So I used my MacBook Pro to create a USB bootable disc with Sierra, and tried that, but wont work because of "architecture". Please help. What should I do? Do I have to buy Snow Leopard to get back to where I was?