GarethRayne,
I think this is your problem.
Im into computers and such, so i know my way around them.
How you got away with installing any hardware while the computer was running is amazing. I recommend you take a look into computer parts and the effects of static electricity, also known as electrostatic discharge (ESD).
As for an answer, I would say primarily you're the problem. Read up on proper computer repair methods and safety precautions. Then reevaluate your situation. For all we know, you're hosing out your case with water because it's dirty, after which, posting messages on daniweb asking why your hard drive doesn't work.
J_