I'm thinking of upgrading my power supply. I'm pretty sure my PC does not have a propietary power supply (bought early 2004), but the back side covers the on-off button found in many power supplies, such as this one: http://www.antec.com/us/productDetails.php?ProdID=23500 Picture of backside. Notice it covers most of the power supply. http://www.billigdrucker.de/images/hardware/komplettsysteme/dell/dell-dimension-8300_back.jpg I know I have few options. 1) Upgrade to the PC Power and Cooling one, shown here: http://www.pcpower.com/products/viewproduct.php?show=S41D2 2) Open a hole in the back of my case to be able to fit other power supplies. What do you guys recommend?