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I try to boot from Rasbperry PI 1B version 2011.12, but it only shows the Red light but nothing happen. I try difference OS with no luck.

The problem is the power?

  • Check the power supply is still giving 5V (by measuring between pin#2 and the outer case of the USB. I had a power supply go bad that would light the red led but wouldn't boot the old RPi. – Dougie Aug 6 at 18:51
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If you tried different OSs, the problem is most likely the power. Check if your power supply is 1.8A. Here's a link to the power supply requirements of the different models of the Pi: https://www.raspberrypi.org/documentation/hardware/raspberrypi/power/README.md.

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