IMS-IT. I would clear the SEL, power down the server and swap positions with the PSU's.   Check to see if the error follows the PSU to the second slot. If so, then you have narrowed down the issue to the PSU and not the motherboard, Regards,
On our  new T620, I'm seeing an amber light blinking on the back of the server and a "VLT0204 System PS1 PG PowerEdge T720 Fail voltage is outside of range" message on the display on the front. In OpenManage, everything is green except System -> Main System Chassis -> Voltages, it lists a Bad reading and a "System Board PS1 PG Fail".  This would be power supply #1, right?  Not totally sure where to go from here, is there another way to test for a failing/bad PSU before I request a replacement?   Any advice appreciated, thanks.
Dell t620 showing PS1 PG Fail