Just curious what went wrong...
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Do I have H/W damage?
It could be corruption of the content of the SD card containing the Operating System, or it could be failed/damaged hardware.
That was probably the point of the diagnostic step already suggested. If your board boots from a fresh SD card with a clean install of the Operating System then the hardware is ok and you can focus on extracting important data from the suspect card.
If the board will not boot from a known good Install of the most recent Operating System then you probably have a failed board or associated Power Supply.