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If you're having trouble with your Raspberry Pi 4 or 400 not booting, usually the culprit is a bad power supply or problems with the SD card or image. If you've confirmed that the power supply is good and it's not even showing the usual power-on screen, check to see if the green LED is flashing - it could be giving you a hint as to what the problem is. From [https://forums.raspberrypi.com/viewtopic.php?t=58151 the Raspberry Pi forums] ---- If a Pi fails to boot for some reason, or has to shut down, in many cases an LED will be flashed a specific number of times to indicate what happened. The LED will blink for a number of long flashes (0 or more), then short flashes, to indicate the exact status. In most cases, the pattern will repeat after a 2 second gap. <pre> Long flashes Short flashes Status 0 3 Generic failure to boot 0 4 start*.elf not found 0 7 Kernel image not found 0 8 SDRAM failure 0 9 Insufficient SDRAM 0 10 In HALT state 2 1 Partition not FAT 2 2 Failed to read from partition 2 3 Extended partition not FAT 2 4 File signature/hash mismatch - Pi 4 4 4 Unsupported board type 4 5 Fatal firmware error 4 6 Power failure type A 4 7 Power failure type B </pre> so: *if the ACT LED blinks in a regular four blink pattern, it cannot find bootcode (start.elf) *if the ACT LED blinks in an irregular pattern then booting has started. *if the ACT LED doesn't blink, then the EEPROM code might be corrupted, try again without anything connected to make sure. ---- At least one of these flash codes (SDRAM failure) means your Pi has a hardware fault and you should get it exchanged if it's still under warranty. Earlier Raspberry Pi models also have flash codes. Check out [https://forums.raspberrypi.com/viewtopic.php?t=58151 the Raspberry Pi forums] for more information.