Typically, a very dim indicator light indicates that the board is in bootloader mode.
Does it show up as “STM32 BOOTLOADER” on your computer?
Does it show up as “STM32 BOOTLOADER” after using BOOT+RESET?
If it doesn’t show up as bootloader, even after using boot+reset, then the board is probably dead. If that is the case de-solder everything and try again. (If it suddenly starts working, then obviously the problem was in the wiring, not the board.)
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