I am using Raspberry pi 3 Model B+ and using Ubuntu Mate operating system not Raspbian Os I am also using raspberry pi 3 supportable original charger of 5.1V 2.5A. still i am facing the same rainbow screen issue on system startup. I have inserted same ubuntu mate Os image file compatible with Raspberry pi 3B+ loaded memory card in Raspberry pi 2 Model B and it is working fine. Please help me to solve this issue as soon as possible. Thank you in advance. :)
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rainbow screen issue
? It is not unusual to say that screen on startup... – Dirk Nov 18 '19 at 15:52