Beats X charging but not turning on?

My Beats X had simply run out of battery. I charged them and all was like normal; the light went from red to blue to show they are charged, however they are now not working.

They do not seem switch on. I have charged them with a genuine Apple charger, connected to laptop to check for updates (which showed they are up to date) and tried holding down the buttons to reset but they still do not work.

I have had no prior issues with the headphones, which are about 1 year old now. Any suggestions would be hugely appreciated.. I hate using the iPhone issue headphones! ☹️