I recently upgraded my computer, and tested it without my case's sides on. It worked just fine, so I plugged a fan that was on my cases side on, put the case sides on, and put the computer in its normal place. I then tried to turn on the computer, but it did not work. The other things I had plugged in to the power strip i was using worked fine, so that wasn't the issue. I figured that the power supply had died, so i bought a new one, set it up, and turned the computer on with the sides off. it worked, so i put the sides on, plugged the fan in, and turned it on, it did not work. I have no idea what is causing this, and when i removed the case sides with the second power supply, it still didn't work. Both power supplies provide enough power to support the system. Does anyone have a clue why this is happening.