Hello when i try to boot up with a fresh install of the latest vertion of noobs it just shows a rainbow screen.
What do do to fix this?
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Are you using NOOBS 3.5.0 from https://www.raspberrypi.org/downloads/noobs/?
Do you really need the multi-boot capability? If you do, then use PINN https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=142574 as it's an enhanced version.
To get started you should probably forget NOOBS and just use the RPi Imager tool to write plain simple RaspiOS directly to your SDCard.