no usb conection

[ozzmaster]

running open source desire , was working fine ,but after over air update (i know my wife ran it) it failed and i thought it booted back as it was before ,but now when i plug to pc all i get is charging on phone and usb device not regcognized.tried different pc's all 3 with htc drivers same on all of them,tested cable also ,cable and pc work fine with desire HD .Is this a common problem or is it actually my hardware that failed ,if that is the case how can i go back to telus shipped rom from my sd ..thanks in advance