unsual charging problem, charger & usb cable

[mikewest]

I am having an unusual charging issue.

I have identical AT&T mini-usb chargers in each of my three vehicles. Each on also has a USB Port on it.

I have the wall plug, with USB port at home, the stock USB cable does not leave the port, and is always attached.

Now with the little background info explained, I was able to charge my phone(s) with all four chargers, including the ability to connect the USB cable to the USB ports on the AT&T car cables.

Starting two days ago, all three car cables will not charge my phone with the attached mini-usb cable. When I plug it in the bright white light turns off, and the phone does not charge. If I plug a USB cable (the one I use is from a Palm Pre) into the USB port and the phone WILL charge. The same attached cables will charge and LG Lotus, and a Palm Pre.

The home USB charger with USB cable plugged into the USB port will not charge my EVO anymore, but will charge a Palm Pre and LG Lotus.

I assume that since the same thing happens with all three cables in all three vehicles, the issue would not be chargers.

If I take the HTC USB cable that is normally attached to the wall plug, and plug it into the USB port on the car charger, or on my MacBook Pro, it WILL charge the phone.

It seems to me, that each likely possibilty has been ruled out. I do have the TEP on my phone, but I fear what Sprint will send as a replacement if I get it repaired. (My local sprint store will not repair a phone with a scratch on the housing.)