perhaps the fan mount has come loose, or something is unbalancing it. I would open the case and have a look while it's runningYou should probably expect to have to replace it though
I think it's the fan, it seems to be moving around instead of just spinning and staying in the same place
Yep. Turn the power off, take the psu completely out, see if you can open it up and diagnose the problem more accurately. Also, start looking on newegg for a new psu
Sorry that I'm being a idiot since I know nothing about computers but how would I install a operating system like would I have to buy one for a disk? Just asking.
http://www.techspot.com/news/50474-teen-electrocuted-while-salvaging-parts-from-a-computer.html