Pi Not Booting/SD Card Troubleshooting

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Pi Not Booting/SD Card Troubleshooting

Post by Jake » Mon Feb 06, 2017 10:58 am

If your Raspberry Pi is not booting, please check the quick start guide below and ensure that all parts are correctly plugged in and installed. The micro SD card must be installed into the Pi's micro SD card slot!

https://www.modmypi.com/blog/raspberry- ... tart-guide

If the Pi is correctly installed with peripherals, in 9/10 cases a non-boot is due to one of the following:

1. A corrupt SD card OS install. Indicated by red light steady on, but no green light showing

The easiest fix is to completely format the card and re-install the OS using the following this guide below on how to install NOOBs:


If this does not work, there is a guide on formatting "dead" SD cards here, which we've used quite successfully to raise cards from the dead :mrgreen: :mrgreen: :mrgreen:

https://www.modmypi.com/blog/how-to-for ... dead-cards

It should also be noted that pre-loaded SD cards will not show full capacity when inserted into a Windows/Mac PC, for example a 16GB card only showing 30MB. This is because the SD card is pre-loaded with the Raspberry Pi Operating System NOOBs and is therefore in a Linux format (which is unviewable in Windows). The full storage capacity will be available on your Raspberry Pi, so simply plug the card into your Pi and it will be available.

If your Pi cannot see the full capacity, you can expand the root partition from the Raspberry Pi configuration menu. To bring up the menu type the following command into the command line.

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sudo raspi-config
Then select "expand_rootfs" from the Raspberry Pi configuration menu. This will expand the OS image to fill the entire SD card.

Finally, if you are receiving a "write protected" message when trying to format your card, please check the write protect switch on the micro SD card to SD card adaptor. This should be in the unlock position.
writeprotection-sdcard.jpg (147.37 KiB) Viewed 3016 times
If you have an alternative SD card adaptor try this and see if the problem persists. Write protection can also sometimes be solved/removed by following the "dead" SD card link above.

Once you have installed the OS and have a successfully booting Pi, it's always best to update your OS image by using the following commands.

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sudo apt-get update

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sudo apt-get dist-upgrade
2. Faulty power supply. No red light

The easiest solution is to try an alternative power supply and see if the problem persists. If the red light goes on and the Pi boots with an alternative, then the power supply is at fault and you will need a replacement.

3. Faulty power supply. Pi boots but shows low power warning

The low power warning, shown below, indicates that your Pi is receiving insufficient voltage from the power supply.
under_volt.png (16.02 KiB) Viewed 3018 times
We have seen false warnings on old versions of Raspian OS. So please ensure that you have updated your OS by using the following commands.

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sudo apt-get update

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sudo apt-get dist-upgrade
We have also seen false warnings on 3rd party operating systems, including Retropie & Kodi.

If the warning persists, then once again swapping out the PSU and seeing if the problem persists will demonstrate if the PSU is at fault.

If you are confident that your PSU is supplying the correct voltage, then you can remove warnings (as long as you understand the risks) by adding the following line to the /boot/config.txt file.

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-- Jake
Forum Administrator & Technical Support