My computer specs are: Intel Pentium4 660 Hyper Threading 3.6 Gigabyte LGA775 G5 looking Case with Enermax Noisetaker 485w ATX12v v.2.0 1GB ddr2 Dual channel XFX Geforce 7600GT 2 Dvd drives 320GB Zalman Heatsink/Fan 2 80 mm Fans A week ago I added a 120mm fan to the outside of this case(on the side) http://www.epcbuyer.com/products.asp...ase-qtec-14452 screwed it to the bottom vent, the fan is pluged to a 4pin cord. I didnt didnt have time to test it until the next day to find out that my computer wont turn on, no lights, no fan movement, monitor is black but asks about monitor connected? when i unplug it from the PC. I dont know why there is a problem because theres a 80mm fan in the fan rack in the case plugged into a 4pin cord too, which ran fine. People tell me its the PSU(485w should be plenty of power to support a extra fan thats 120mm right? ), motherboard or both. I searched the net and read about shortcircuts, and using anti static bags. Which at the time i was sitting on carpet when installing the fan but would any of this be related to the computer not turning on I need to find out why it wont turn on, whats causing this and whats the solutions. It will be Greatful if someone teaches me hows the right way to install a fan.