I have a Dell 2900 Generation ll that has 1 have the power supplies(PS) that is failing. The position of the PS is number 1 Online Status: Presence Detected Failure Detected AC Lost. I bought a replacement PS but when I insert the PS into slot 1 I receive the same error message. I know the PS that I bought has a replacement works fine since I watched it power up another server. So what I am looking for here is the process that is used to troubleshooting the exact problem. I have already looking through the dell docs for the PowerEdge 2900 but was not able to find the process that is used for this type of problem. The server is running with WSE 2012 on it and it is an active server connected to Office 356 Enterprise.