No light when charging
Unit sat for along time and now it won't charge
@alantordoff possibly an issue with the battery having discharged below it's charging threshold. That basically means that the battery has discharged to a point where it no longer accepts a charge. I would start of with a new battery. Use this guide Sony WH-1000XM4 電池更換 for that.
A new battery will also give you a known well starting point should it become necessary to troubleshoot further. If the new battery doesn't fix this, you will need to check the charging port and charging circuit.
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