Dell OptiPlex 780 SFF/Core 2 Duo E8600 @ 3.33 GHz/2GB DDR3/250GB HDD/DVD-RW/WINDOWS 7 PRO 64 BIT

hello I'm making this video to show some troubleshooting and repair tips for the Dell Optiplex 780 desktop PC this is a very common model of desktop PC still used by many businesses these instructions are also applicable to the 745 755 and 760 models of Dell Optiplex PC also still in very common use in many businesses for this for this demonstration I have a Optiplex 780 that has a failed power supply to identify the failed power supply I was able to plug it in and press the power button and there's no activity on the chassis no fan spin and no activity lights illuminate other than a slight flicker I can bypass the power some of the power supply functionality with a reset button on the back which indicates to me that a component inside the power supply has failed to replace a power supply on one of these model systems you open the chassis by pulling the tab on the side or top generally