Disk utility not recognising WD 1TB HDD

I've been in the apple store about 4 times this last week or so, my mac was running fine, but it needed a new track pad, a new charger, new logic board (because of the diplayport) and a new base because the feet had came off. I picked it up the day after it was booked in, it worked in the shop, i took it home and got the flashing folder icon. I went back down, and the guy said it was because the hdd (it had a WD scorpio blue 500GB in) had failed, so i bought a new one (the WD scorpio blue 1TB) and it wasn't recognised. So i went back down today, and saw a different genius who tested my mac then tested the hdd's in another mac, the 500gb had failed but the 1TB was recognised in another mac, so she changed the hdd cable and showed me it worked.... rebooted.... still working.... so we turned it off and i took it home. Now, i've just turned it on, and same result.... not recognised, any ideas? I'm using a SL 10.6.3 disk to get disk utility up, i'm wondering if it'll just be the 10.6.6 that will work?

Do you have the MDD?
Did you use Cable Select for both? I assume you have both optical drives on same IDE bus.
End position needs to be master jumper and the middle needs to use slave jumper setting. or both need to use CS,

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