Harddrives not recognized

[Trumpetblast]

I have a MacBook Pro 13" late 2009, running Snow Leopard. About 10 months after the purchase, I had problems. Took it in and they said the harddrive was bad. They replaced it. I just started having the same symptoms of harddrive failure again...spinning circle, system freeze. So I purchase a new harddrive, formatted it with the disk utility, restored my time machine backup. It completed the restore and restarted. After restart it didn't work. I tried rebooting several times as it continued to tell me to do, but nothing happened. I started to run OS from disc again to reformat the new disk, but the disk utility didn't recognize the new harddrive. I put the old harddrive back in as well, and it doesn't recognize the old harddrive. I have reset pram and smc and have run hardware tester, but nothing helps. Any solutions??? Running without the OS from DVD only shows the flashing question mark/folder.