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I purchased the CANAKIT Raspberry pi with the Canakit power supply. I purchased the pre-loaded microsd card. On first power up I got the rainbow and the lightning bolt (no menu) I've tried 3 alternate power supplies and plugging the usb cable into my computer USB port. No change!

  • sounds like a bad power supply .... your computer's usb port has its output current limited to 500mA by design, therefore it does not have the capacity to power an RPi – jsotola May 20 '18 at 3:52
  • If you have a multimeter handy, try checking the voltage across the Pi to see if the power supply is within range. Also, perhaps edit your question to include what version of Pi you have, and what rating your power supply has (it will probably have voltage/current ratings on the plug itself). – Aurora0001 May 20 '18 at 9:20
  • Does this answer your question? What does the lightning bolt mean? – null_override Sep 20 at 10:45
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In my case it was a bad contact in microUSB socket on Raspberry Pi.

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