Well, I put in my new harddrive and inserted my restore disc in, and it's still not working. In the XP installation, I only get as far as which drive I want to install the OS in, and the computer doesn't detect anything in any of the drive bays (both the harddrive and optical drives). So, I think I can say that, my computer is "dead."
I'm gonna try to see if I can get this fixed at a repair shop. If not, then it's time for a new computer. I would also have to get an XP software kit off of somewhere (I'm not a fan of Vista).