I'm trying to connect my laptop to the court's multimedia cabinet via their VGA cable in order to connect to their projector. I'm using an HDMI to VGA converter because my laptop didn't come with a VGA port and my problem is this: as soon as I plug the VGA cable into the converter, my computer display starts wigging out and cutting off & on to the point where I'm unable to open and change any of the settings... what do I need to do to fix this problem?