Why is My Nokia e63 not charging?

please i need help and advice.

I plugged in my e63 today and it showed that it was charging. After that the screen went off and it refused to on. Before the, the charging port worked perfectly.

I had to boost the battery with desktop and i switched on the phone. I discovered that if i plug the phone, the blue light indicator on the charger switches off and when i remove it, it switches back on. Sometimes i will plug the phone and it will charge for a second and immediately stop charging.

Please what can i do?? Can i fix it or should i leave it and continue charging it using desktop??