Mine is NOT ROOTED & at day 21 the USB port &/or cable went buggy immediately after I purchased & used a car charger from the Sprint store (employee insisted it was the "correct" charger for EVO after telling me NOT to use my Palm Pre chargers & cables even though the ports were the same....he said the Pre equipment xfrd a diff current or wattage. Who knows if that's bad info or not, btw .)
The problem started off as totally non-functioning for charge, pc sync, et all, then after using the Sprint car charger exclusively for several days - just to be able to use the EVO at all- & freaking out about it to Sprint Tech Support & at the store, it just suddenly started charging if I touched or bent it a certain way, like it had a short or bad connection.
Next, I visited a Sprint repair store & they just reset the "USB debugging" option to ENABLE/ON (again) & then the USB cable would work for pc sync and sometimes charge as well.
After 6 weeks I'm left with having to ditch the wall outlet adapter plug from the orig box, put a cig lighter/USB plug from my iTouch on it & plug it into a cig lighter wall plug adapter to charge at home in the wall.
I'm pretty tech savvy & I still can't tell if it's a software issue with the cable or the EVO port, or a physical issue with the cable or the port, or some combo of all 4 options. I love my EVO so I adapted & moved on, but definitely logged my complaint loudly with Sprint, insisting they extend my 30 days until the issue is 100% resolved.
I hope that my experience solves your own mystery.
Sent from my EVO 4G - HTC SuperSonic