Hard drive installation issue.

I'm replacing the internal hard drive on my 24" duo core Intel iMac (EMC 2134). The new drive is a 1TB Seagate Barracuda 720.12 and everything appeared to be going well, old drive out new drive in, everything back together and healthy bong on start-up.
Problem is that the DVD drive refuses to work when the new drive is in place so I can't format the new drive. Installation DVD goes in OK but after that nothing and it won't eject either.
So I take everything apart again, re-connect the old drive and hey presto the DVD drive is working again, DVD ejects - hooray. Re-connect the new drive and once again the DVD drive won't play ball.
Am I mising something? Is there a workaround or is there something wrong here?
Appreciate any ideas.

Seagate has been a problem for many, don't know if it has jumpr settings, but I'd oipt for one of these...
http://eshop.macsales.com/item/Western%20Digital/WD1002FAEX/
At least a jumper on pins 5&6 will slow it to 3 Gb/s.

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