After connecting power to rpi I get fast power led enable, then it's off. I tried reflashing EEPROM, enabling without all, pressing F10, trying 2 wires and PSU. I tried 2 SD cards, flashed using Raspberry Pi Imager, one from my other Raspberry Pi. It's also heating up when stays connected.

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    If I remember correctly, you need a microSD card for the OS on a 400. You didn't say you had one, so I'm guessing you didn't put one in. If you did, please edit the question to say you did and what did you do to burn an OS to it. – Unsigned_Arduino Jan 21 at 2:46

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