I have an RPI4 (Buster) with SD Card for root storage as a home server. Recently I noticed that it does not boot up automatically after power outages. When the electricity is turned back, all lights are solid (red and green) and nothing happens. But re-connecting the power plug usually helps and RPI boots normally. I don't have any kind of buttons on my power supply, it's just a regular power supply plugged directly into a socket. At the moment, I'm not at the same location where RPI is set so I don't have any physical access to connect the display and see BIOS output when the problem is ongoing or perform other ways of in-place troubleshooting. But I have SSH access and can manage the system while it is running. I would be grateful for some ideas for where to look, but I would prefer not to make any critical modifications to the boot configuration because if it fails I will lose access completely.
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I will take a SWAG: I have seen this many times over the years with many computers, it is the Power. Build a small circuit that detects power failure and when it comes on delay the pi from being powered for a few seconds. Without being there I can only assume that other appliances yours and others on your transformer have appliances that are coming back on especially units with motors and compressors for starters.
I have built a PCB that has a counter and a watchdog input. When the power comes on it powers the load, when it does not start batting the trigger it turns of for 8 seconds then starts over until it is getting patted.
Gil
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