You are a friendly bunch, (Sarcasm)
I would of told him to adjust the angle of the camera away from street light and ask him if it was reflecting off of any vehicles etc or do a reset on camera, he may have messed around in the OSD and screwed something up since he is a noob or try a different cable or move the camera to a different location as a last result away from any lights that could be interfering with the IR's. I would of tried to offer some help not just give him a hard time because he was a noob and easy to pick on.