Hello,I am trying to power my arduino uno using a USB cable plugged into a PC. However, I am not using the built-in USB jack on the board. I have isolated and verified that I am getting 5V out of a USB port, but this changes to 2.7V when I connect the power to the '5V' and 'GND' jacks in the 'Power' area of the arduino.I have noticed that connecting resistors between the USB port and the arduino pins increases the voltage measured if the resistance is less than about 500 ohms (with 400 ohms resistance I get about 4V).Any ideas? Please ask if I have left out important information.Thanks for your help.-John
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