My new charger is working but not on the computer?

My new iphone 4 charger is completely working except when i plug it in the computer its keeps on going on and off and on and off repeatedly and its the only charger i have most of my chargers are not working so is there a way i could make my charger stay on so i can put music on my phone on itunes?

The computer's USB port does not always deliver enough power to charge an iPhone. Power is drained by things like Wi-Fi, bluetooth and the normal phone functions. You can help by putting the phone on flight mode or switching the phone off while charging. It will take longer than your normal charger.

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