Thank you for posting and welcome to the Bose Community. I am sorry to read that you have experienced an issue with your QC15's and would love to assist you with this.
As you have already attempted all of the steps that we would recommend for an issue like this and you still see no LED on the headphones, I would highly recommend getting in touch with our customer service team via clicking this link, The team will be on hand and ready to help.
If any other users have this experience and have attempted the steps that are in the title of this thread please do reach out to our customer support team via the link above.
Hector B - Community Support