New drive in Macbook - does not appear in Disk Utility on DVD or FW

I put a new hard drive into my macbook, installed it properly as far as I know, but it does not appear in Disk Utility, either from booting from the FireWire copy of the OS, or from the DVD disk utility.

What could be wrong here? It's a SATA drive so there are no jumpers, and I assume it is formatted for windows from the store (its a WD).

All I can think of is that it's not installed right... but I was able to replace the L panel under the battery and put the batter back in properly.

what could be wrong here?

UPDATE: Nevermind. Apparently it is QUITE possible to put the drive/tray assembly upside down into the macbook and still be able to close up the cover and battery.

It's working now, I'm an idiot.