My raspberry was not booting up. Both LED where flickering occationally. I plugged in a monitor to check whats wrong. The monitor showed the startup screen which is a test screen with all possible colors, alternating with going black.

I also recognised a lightning symbol in the top right corner.

closed as off-topic by user68186, Rinzwind, Eliah Kagan, Kulfy, Zanna Jul 13 at 17:36

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Now you can set up a new SD card because you think your image is broken (which I already did once).

Or you can just use another cable (or power supply) to make sure the raspberry is getting full power.

In my case it really was just the cable since my power supply itself was alright.

You can also check out this.

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