Well this has been educational! I always take apart the PSU when I clean the computer, only one time have I heard that those capacitors store power even when switched off and disconnected from the wall, glad I took those words to heart when my buddy told me >.>.... The PSU I noticed attracts allot of dirt, and then when the fan fails and you have to custom mod it to fit the new 120mm fan. This is crazy, didn't really realize I was playing with fire like I was. Definitely going to take allot more care when I clean it again... Like other users mentioned though, I always discharge the power before I take it apart, I switch the unit off then disconnect it from the wall then press the power button to make sure none is left over.