Go back into BIOS and, if you can't see anything to fix, reset to defaults?
Sorry, forgot to mention I have tried that.
How did you run chkdsk if it's not starting - safe mode or recovery drive?
Do the contents of the drive look correct apart from whatever is stopping Windows starting properly?
@IrPOWERranger started
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Go back into BIOS and, if you can't see anything to fix, reset to defaults?