It appears that you not only played with the hardware, as you said in your first post, but with the configuration settings too 
I did? I was trying to install a new hard drive, must have fubarred it then.
Still not sure if I should just reinstall from MyLiveCD and then update all of the file systems while I'm at it.
If I do that, what file system should I use? When I installed the new HD usins ext4, it now appears only as a file in/root instead of aas a hard drive that contains file.
I'm so confused!