Iphone 4 not working when plugged in to USB

[Wr12]

It charges when i use the outlet but not when I plug it in to USB on my mac, in the USB prober where i plugged the phone in it says IR receiver (device suspended). I doesn't work on any computers, I've tried different USB cords. It is jailbroken on iOS 5.0.1. SHould i just try updating to 5.11 on the device and seeing if it fixes the problem? What do I do?