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Sorry for the wait. My name is Michael. I will be helping you with your question today.
Please try the following:
- The phone might need hard Shutdown. remove the battery and while the battery is removed hold the power button down for 5 seconds to fully drain any power in it.
- The battery contacts might be dirty, please clean contacts on both the phone and the battery itself with a clean Q-tip.
- Try another good working power cord that fits the phone.
- It could well be the battery itself that needs replacement.
If none of those tips work for you, please let me know the full model number of the phone for further research.