I think you created a new computer. There isn't any original componemts for the computer to boot to. It's new, not anything undetected. But, that's what it's saying because hasnt ever detected in the first place.
If you got one of those pci-e by pass cards, you need to hook your dvd and cd there, and use the ide cable to your hd from the mobo. I did, and it then booted.
I would also go to the bios, click ont eh load defaults, make sure the time and date are set, and that the ps2 is activated.
The jumper on the mobo might get it, to. It's the three pins connected by a plastic jumper. Move it over, then turn on the computer, let run a minute, and shut it off and replace the jumper back. This gives the computer to search out new components, and enter them in bios. It's a three pin, connectd by a two pin plug.
I know it'sa alot of work, but these are the problems I have ran in to when my comp. didn't boot.
You might try one hd that works, and that would convince yo that the comp. works. If does, and that would make it your hd, make sure you have a plastic jumper in the hd. It usually closet to the ide pins.