I have a Dell Precision T3400 on Windows Xp Pro Sp3 and whenever i connect an external Hard drive, it dies after a few seconds. However the drive works fine in other computers. How can I debug USB power issues?
It's not going to be easy, but you could strip your USB cable and put one of the wires through an amp clamp meter to see the draw. You could also plug in a powered hub into the computer to see if that makes a difference.