pi 3 - Red led on and nothing happens RPi3 - Raspberry Pi Stack Exchange
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Is a red LED turn off during boot of RPi 3 a sign of problems? - Raspberry Pi Stack Exchange
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Add a status LED to your Raspberry Pi | by Alex Ellis | Level Up Coding
BlueJ - LED Tutorial
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pi 3 - Raspberry Pi 3 Model B+ Stable Red Light When Powered Up - Raspberry Pi Stack Exchange
R-Pi Troubleshooting - eLinux.org
