ActiveSync Will Not Work!

[sovrce]

I just got back from Alltel, plugged my device in and got ready for a night of modding. It synced up within the first 30 seconds, recognized the device and opened exactly like it should. I was able to transfer one file (MS Compact .NET Framework 3.5) before the connection died. I unplugged it, plugged it back in again and it synced up, recognized again. I managed to put a 'WeatherCitiesCustomizer.CAB' file on my phone before the connection dropped again.

As it stands now, I plug the phone in, it makes the "connected" sound and nothing. It just shows the 'Charging Icon' on my phone and it says "Not Connected" in ActiveSync. I reset both my phone and my computer, but nothing.

What is going on? Did I get a defective phone? Did I mess something up? Anyone have any idea on this one? Is a hard-reset in order?