I got the power supply yesterday and installed it as soon as I got back from picking it up at the post office. I felt like a kid on Christmas morning!
Anyway, that's what it was! I tested it, putting the jumper on to see if the fan worked, before I installed it.
It's a "new" computer that someone gave me after it sat in their garage for a year and a half. It's running Windows ME and isn't too shabby for a back up.
However, after tinkering with it for awhile, cleaning up all the crappy crap that was on it and updating through Windows Update, I seem to have lost the ability to access the internet. Neither Firefox or Internet Explorer can access the internet. I will post this under a "new issue" within Windows 95/ 98/ ME.
Thanks to all who helped with the previous problem and hopefully someone can lead me in the right direction for this one.
Edited by elomont, 13 February 2009 - 10:23 PM.