@eilidhtrodden well this sure sounds like a dead charging port. For that you want to go ahead and replace it. Use this guide [guide|155212] for the repair. If you reside in the USA you can get the part from here [product|IF466-005] If you do not, do a simple online search for a replacement board in your area.
Do not forget to also check the flex cable coming from the charging board to the mother board. Make sure that there are no tears on it and that it is not corroded etc. While you have it already disassembled, might as well replace the battery as well. That way you will not have to worry about it later. [guide|163953] Again, if you reside in the USA you can get the battery from here [product|IF466-010]
Now, in the extremely rare case that a board replacement will not work, you are going to have to do some board level checking/repair
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