Hi Paddy. I'm sorry that you're having this problem and I will do my very best to help you.
This problem and many others are often the result of a "glitch" in the software. Luckily, it is easily fixed.
You've probably already done a soft reset, with the following steps:
Since that did not solve your problem, you will need to do a full factory reset. This time hold the power button or switch in the off position for a full 40 seconds. This should reset the Kindle to factory defaults.This will reset the Kindle back to the way it was at the time of purchase. If the device requires you to set it up again, then the factory reset was successful.
If even a full factory reset is not successful, then you have a hardware issue. The problem could possibly be with the charging cable. It is very common for charging cords for any electronic device to fail, as they are easily damaged if they are bent sharply or wrapped tightly when stored. I can send you a link for a replacement charging/sync cable IF I know what type of Kindle you have. Do you see a serial number anywhere on the device? That would help me to determine the model.
If you don't see one, please go to SETTINGS and DEVICE INFO on the Kindle and tell me what you see.
Hi there Paddy. You aren't charged for followup questions and comments. I am happy to hear that all is well.
Would you mind taking a moment to rate my service? I'd really appreciate it! As an independent contractor (not an hourly or salaried employee), without a rating I am not compensated in any way for my answer. Thanks for allowing me to assist you. Have a great day!