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!
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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 03:52
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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 09:20
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Does this answer your question? What does the lightning bolt mean? – null_override Sep 20 '20 at 10:45
