I just had to replace my front driver and passenger window regulators. The passenger one is totally out waiting on a new one to be sent to me. In the mean time I rolled the drivers window down and now it is stuck 1/2 way down. The rear windows work. What is causing the drivers window to not respond? There is no motor noise or any reaction when the switch is pushed. I'm assuming that it's a switch, but don't want to buy one if it's something else.