Mac Pro not booting after restore.

Hi. Hopefully someone can help me here.
Tried a total system restore from my leapard Install disk to a recent time machine backup of Snow Leopard 6.4 after a mishap with Mac Keeper (easily done I tell you)
The drive seemed slow and unresponsive even before this and had initially spat out my two Snow Leopard install disks but I managed to boot from previous original Leopard disk after I shut the machine down for a while. Using utilities, I found the back-up required and started restoring some 435gigs worth which took 18 hours. At times the drive seemed to go to sleep. I was beginning to think that the drive was just about hanging in there with the odd behaviour that had recently happened. I had initially thought the disks must have been scratched but it was stating it could not read other disks too so I guess there is a definite drive problem going on.
Anyway, eventually the next day my sceen stated that the mac was restored. Tried to boot. Gray sceen of death. Telling me to shut down and reboot. Happened every time. Tried starting command +S.where it's stating "Mac OS not yet set". It wont let me type anything. Tried rebooting from leopard again to see what disk utility was finding. All seemed OK. The computer is seeing the drives and the content amounts. Tries varifying/repairing disks. all OK. Tried repairing permissions on sysem drive which finished in a split second. I'm thinking of changing the superdrive and backing up again but this may not be the problem at all. I did have a file that said previous system on the Mac for some reason separate to the system it was using. Could that be a problem here. Any help greatly appreciated. Thanks James
Mac Pro - Snow Leopard 10.6.4 (2006-2008)

Hi
Thanks for replying.
Yes I booted from Leopard install disk as the dvd drive wasn't seeing either of my Snow Leopard ones.
From utilities menu I restored a time machine backup that I had done just before using Mac Keeper. This was meant to be a complete system install as I didn't know what files Mac keeper had moved. Though it took a long time, it finally stated that it was restored and I thought I was back in business. However gray screen shut down after a few 3 seconds of Apple appearing everytime.
The DVD drive is not letting me boot on leopard install everytime either. Any thoughts

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