I have a Dell Dimension 8400 with Windows XP Pro on it. It's only a year and a few months old. Anyway, a few months ago, I turned on the computer and instead of loading properly, it beeped and nothing showed up on my computer screen. And all I could hear after the beeping was the fan, which I noticed to be abnormal since the machine makes its usual running sounds. So, I opened up the computer and saw that one of the metal strips that covers an unused drive space was loose, so I tightened it back into place, closed up the computer and when I turned it on, all was well. Now, just a few days ago, the same thing happened except nothing I did could make my computer turn back on. I tightened the metal strips, drives, checked all plugs, etc only to find out that whenever I pressed the power button the green light goes on, the beeping happens, but the computer will not turn on and function. All I still hear is the fan on inside the computer. Please help.