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Is the Hba in a traditional server case with lots of airflow? My 9207-8i displayed a similar issue bc it didn’t have enough direct cooling (it’s not in a traditional server/case.) it would never show more than 2 drives at a time and they would often vanish. Once I mounted a fan to it, the Hba has been stable and showing every drive I attach
How old? Is the battery removable? If so, you can try removing the battery, holding down power for about 10s, put the battery back or plugging in the power cord, then retry booting it