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No problem - glad you got it sorted. :)

Ok, you don't need to plug in both power adapters - only the 'I' shaped one. There should be a cable from the PSU that looks like this:

http://en.wikipedia.org/wiki/Image:SATA_power_cable.jpg
...

You're confusing the power supply with the SATA data cable. The data cables have an L shape, but the power cables are flat trapeziums /=\... ish :)