1. One. You don't mention having tried to boot your RPi4B board from a USB Mass Storage device, ie a 'memory stick' or 'thumb drive.' That would remove reliance on the microSD card slot as a boot device.
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no USB mass Storage attached, that is keyboard USB cable connector.
2. Has the board been in a damp, dirty or otherwise hostile environment?
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Yes, the board was in an internal environment in Sri Lanka. Despite being indoors, the persistent high humidity common to the region may have caused some corrosion.
no USB mass Storage attached, that is keyboard USB cable connector.2. Has the board been in a damp, dirty or otherwise hostile environment?
Yes, the board was in an internal environment in Sri Lanka. Despite being indoors, the persistent high humidity common to the region may have caused some corrosion.Statistics: Posted by lsegptx — Thu Nov 06, 2025 5:13 am