last night my iphone was fine and i started to charge it cause the battery went under 20%. when i woke up i wanted to see what time it was and it wouldnt turn on.. i tried a whole new charger and cord and it didnt work so i tried my compy but it says the device you plugged into the usb port is drawing to much power and will be shut down. so i cant connect at all to my phone. any suggestions?