I am having problem while working with Raspberry Pi Model B 4GB.

When I turn on the power of Raspberry Pi the power LED (red) turns on but the ACT LED (green/yellow) just flashes two times and suddenly disappears and Raspberry Pi do not boots.

Please help me out!

  • Have you read the boot sticky forums.raspberrypi.com/viewtopic.php?t=58151#p1485558
    – CoderMike
    Commented Jul 12, 2022 at 6:47
  • The ACT light will only be on continuously in a model 2 with no SD card in (or an SD card it cannot read). Otherwise it just blinks to indicate activity with the SD card, eg. at boot, usually quite vigorously for 5-20s, or, if there is some error with the content of the boot partition, it will blink endlessly in a regular pattern.
    – goldilocks
    Commented Jul 12, 2022 at 14:36

1 Answer 1


The ACT (green) LED is configured in firmware to flash a "code" when there is a failure in boot process. The code has changed over time. I did a quick search for raspberry pi ACT LED codes. The first result seems current, but it indicates there is no code for 2 flashes.

You can also check the "Official-but-hard-to-use" documentation for boot diagnostics, and here again we find no description for 2 flashes.

As you've given us nothing else to go on, the following is offered purely as a GUESS:

  • Power supply < 5V
  • No SD card?
  • Improperly-formatted SD card

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