Hard drive not detected after Linux involved

Hello,

I recently played with Ubuntu installing and uninstalling with my spare hard drive.
After uninstalling Ubuntu from the spare hard drive, I took it out of the pc and put back in my original SATA hard drive which win xp installed and used to work fine but now I have problem. Computer won't detect or recognize the original SATA hard drive. I did not connect original hard drive and spare(linux) drive same time.

What I did was switching original hard with spare hard drive and installed/uninstalled ubuntu. And put this spare hard away and switch back to original hard drive. Meantime I switched bios AHCI to ATA back and forth couple of times when playing with spare hard.

So I am losing my good original one with lots of files in it.
What did I do wrong? How can I revive my original hard? Even I connect sata drive using external USB adapter to my laptop but it doesn't detect sata drive! I tried to boot up with win xp cd or vista cd but error message saying there is no hard drive found.
Help me!!!