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- 12:38, 2022 January 13 Hal talk contribs created page Raspberry Pi 4/400 Flash Codes (Created page with "{{TidBit |shortDescription=The green (ACT) LED on a Raspberry Pi 4 and 400 can indicate what's causing boot problems. |skillSet=Raspberry Pi |featured=Yes }} 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...")