Help! The green LED of my PI does not flash anymore!

Help LED Raspberry

When the green LED of your Raspberry PI does not flash, the system can’t successfully access the microSD card. So you are probably in one of the following situations:

  1. You did not insert a preformatted and flashed microSD card
  2. Your microSD card is corrupted, and does not work anymore


You should always keep a copy of the ISO image of your operating system. If you don’t, please download one at

Flash a new microSD card with the OS (if the old one is corrupted, you should avoid using it again). You can use balenaEtcher: it’s free and has the same GUI for Linux, WIndows and MAC.

Help LED Raspberry

The microSD has three primary parameters:

  • Memory capacity
    • MicroSD = up to 2 GB
    • MicroSDHC (High Capacity) = from 4 GB to 32 GB
    • MicroSDXC (eXtended Capacity) = from 64 GB to 2 TB
  • UHS Speed class
    • MicroSD Class 2 = 2MB/s
    • MicroSD Class 4 = 4MB/s
    • MicroSD Class 6 = 6MB/s
    • MicroSD Class 10 = 10MB/s
    • MicroSD UHS-I 1 = 10 MB/s – Bus Speed 50-104 MB/s
    • MicroSD UHS-I 3 = 30 MB/s  – Bus Speed 50-104 MB/s
    • MicroSD UHS-II 1 = 10 MB/s  – Bus Speed 156-312MB/s
    • MicroSD UHS-II 3 = 30 MB/s – Bus Speed 156-312MB/s
  • Video Speed Class – V6, V10, V30, V60, V90 again it’s the sequential write speed

So, the next time your system refuses to boot, check the green LED on your Raspberry PI and eventually flash a new ISO image. That’s all!

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